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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>6.2 Creating Classes</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="extras.css" title="default"/><link rel="stylesheet" type="text/css" href="icons.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">►</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x"><span style="font-weight: bold">The Racket Reference</span></a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="model.html" class="tocviewlink" data-pltdoc="x">Language Model</a></td></tr><tr><td align="right">2 </td><td><a href="notation.html" class="tocviewlink" data-pltdoc="x">Notation for Documentation</a></td></tr><tr><td align="right">3 </td><td><a href="syntax.html" class="tocviewlink" data-pltdoc="x">Syntactic Forms</a></td></tr><tr><td align="right">4 </td><td><a href="data.html" class="tocviewlink" data-pltdoc="x">Datatypes</a></td></tr><tr><td align="right">5 </td><td><a href="structures.html" class="tocviewlink" data-pltdoc="x">Structures</a></td></tr><tr><td align="right">6 </td><td><a href="mzlib_class.html" class="tocviewselflink" data-pltdoc="x">Classes and Objects</a></td></tr><tr><td align="right">7 </td><td><a href="mzlib_unit.html" class="tocviewlink" data-pltdoc="x">Units</a></td></tr><tr><td align="right">8 </td><td><a href="contracts.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">9 </td><td><a href="match.html" class="tocviewlink" data-pltdoc="x">Pattern Matching</a></td></tr><tr><td align="right">10 </td><td><a href="control.html" class="tocviewlink" data-pltdoc="x">Control Flow</a></td></tr><tr><td align="right">11 </td><td><a href="concurrency.html" class="tocviewlink" data-pltdoc="x">Concurrency and Parallelism</a></td></tr><tr><td align="right">12 </td><td><a href="Macros.html" class="tocviewlink" data-pltdoc="x">Macros</a></td></tr><tr><td align="right">13 </td><td><a href="input-and-output.html" class="tocviewlink" data-pltdoc="x">Input and Output</a></td></tr><tr><td align="right">14 </td><td><a href="security.html" class="tocviewlink" data-pltdoc="x">Reflection and Security</a></td></tr><tr><td align="right">15 </td><td><a href="os.html" class="tocviewlink" data-pltdoc="x">Operating System</a></td></tr><tr><td align="right">16 </td><td><a href="memory.html" class="tocviewlink" data-pltdoc="x">Memory Management</a></td></tr><tr><td align="right">17 </td><td><a href="unsafe.html" class="tocviewlink" data-pltdoc="x">Unsafe Operations</a></td></tr><tr><td align="right">18 </td><td><a href="running.html" class="tocviewlink" data-pltdoc="x">Running Racket</a></td></tr><tr><td align="right"></td><td><a href="doc-bibliography.html" class="tocviewlink" data-pltdoc="x">Bibliography</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">▼</a></td><td>6 </td><td><a href="mzlib_class.html" class="tocviewlink" data-pltdoc="x">Classes and Objects</a></td></tr></table><div class="tocviewsublist" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">6.1 </td><td><a href="createinterface.html" class="tocviewlink" data-pltdoc="x">Creating Interfaces</a></td></tr><tr><td align="right">6.2 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Creating Classes</a></td></tr><tr><td align="right">6.3 </td><td><a href="objcreation.html" class="tocviewlink" data-pltdoc="x">Creating Objects</a></td></tr><tr><td align="right">6.4 </td><td><a href="ivaraccess.html" class="tocviewlink" data-pltdoc="x">Field and Method Access</a></td></tr><tr><td align="right">6.5 </td><td><a href="mixins.html" class="tocviewlink" data-pltdoc="x">Mixins</a></td></tr><tr><td align="right">6.6 </td><td><a href="trait.html" class="tocviewlink" data-pltdoc="x">Traits</a></td></tr><tr><td align="right">6.7 </td><td><a href="Object_and_Class_Contracts.html" class="tocviewlink" data-pltdoc="x">Object and Class Contracts</a></td></tr><tr><td align="right">6.8 </td><td><a href="objectequality.html" class="tocviewlink" data-pltdoc="x">Object Equality and Hashing</a></td></tr><tr><td align="right">6.9 </td><td><a href="objectserialize.html" class="tocviewlink" data-pltdoc="x">Object Serialization</a></td></tr><tr><td align="right">6.10 </td><td><a href="objectprinting.html" class="tocviewlink" data-pltdoc="x">Object Printing</a></td></tr><tr><td align="right">6.11 </td><td><a href="objectutils.html" class="tocviewlink" data-pltdoc="x">Object, Class, and Interface Utilities</a></td></tr><tr><td align="right">6.12 </td><td><a href="Surrogates.html" class="tocviewlink" data-pltdoc="x">Surrogates</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_2");">►</a></td><td>6.2 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Creating Classes</a></td></tr></table><div class="tocviewsublistbottom" style="display: none;" id="tocview_2"><table cellspacing="0" cellpadding="0"><tr><td align="right">6.2.1 </td><td><a href="#%28part._clinitvars%29" class="tocviewlink" data-pltdoc="x">Initialization Variables</a></td></tr><tr><td align="right">6.2.2 </td><td><a href="#%28part._clfields%29" class="tocviewlink" data-pltdoc="x">Fields</a></td></tr><tr><td align="right">6.2.3 </td><td><a href="#%28part._clmethods%29" class="tocviewlink" data-pltdoc="x">Methods</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">object%</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">class*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">class</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">this</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this~25%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">this%</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inspect%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">inspect</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">init</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">init-<wbr></wbr>field</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._field%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">field</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">inherit-<wbr></wbr>field</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">init-<wbr></wbr>rest</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">public</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">pubment</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">public-<wbr></wbr>final</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">override</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">overment</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">override-<wbr></wbr>final</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">augment</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">augride</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">augment-<wbr></wbr>final</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">private</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._abstract%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">abstract</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">inherit</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">inherit/<span class="mywbr"> </span>super</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">inherit/<span class="mywbr"> </span>inner</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">rename-<wbr></wbr>super</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-inner%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">rename-<wbr></wbr>inner</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">public*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">pubment*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">public-<wbr></wbr>final*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">override*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">overment*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">override-<wbr></wbr>final*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">augment*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">augride*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">augment-<wbr></wbr>final*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%2A%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">private*</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>public</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpubment%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>pubment</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic-final%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>public-<wbr></wbr>final</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverride%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>override</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverment%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>overment</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverride-final%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>override-<wbr></wbr>final</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Faugment%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>augment</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Faugride%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>augride</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Faugment-final%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>augment-<wbr></wbr>final</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fprivate%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>private</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2Fderived%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">class/<span class="mywbr"> </span>derived</span></span></a></td></tr><tr><td><span class="tocsublinknumber">6.2.1<tt> </tt></span><a href="#%28part._clinitvars%29" class="tocsubseclink" data-pltdoc="x">Initialization Variables</a></td></tr><tr><td><span class="tocsublinknumber">6.2.2<tt> </tt></span><a href="#%28part._clfields%29" class="tocsubseclink" data-pltdoc="x">Fields</a></td></tr><tr><td><span class="tocsublinknumber">6.2.3<tt> </tt></span><a href="#%28part._clmethods%29" class="tocsubseclink" data-pltdoc="x">Methods</a></td></tr><tr><td><span class="tocsublinknumber">6.2.3.1<tt> </tt></span><a href="#%28part._clmethoddefs%29" class="tocsubseclink" data-pltdoc="x">Method Definitions</a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">super</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">inner</span></span></a></td></tr><tr><td><span class="tocsublinknumber">6.2.3.2<tt> </tt></span><a href="#%28part._classinherit%29" class="tocsubseclink" data-pltdoc="x">Inherited and Superclass Methods</a></td></tr><tr><td><span class="tocsublinknumber">6.2.3.3<tt> </tt></span><a href="#%28part._extnames%29" class="tocsubseclink" data-pltdoc="x">Internal and External Names</a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-local-member-name%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-<wbr></wbr>local-<wbr></wbr>member-<wbr></wbr>name</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-member-name%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-<wbr></wbr>member-<wbr></wbr>name</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">member-<wbr></wbr>name-<wbr></wbr>key</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._generate-member-key%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">generate-<wbr></wbr>member-<wbr></wbr>key</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key~3f%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">member-<wbr></wbr>name-<wbr></wbr>key?</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key~3d~3f%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">member-<wbr></wbr>name-<wbr></wbr>key=?</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key-hash-code%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">member-<wbr></wbr>name-<wbr></wbr>key-<wbr></wbr>hash-<wbr></wbr>code</span></span></a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="createinterface.html" title="backward to "6.1 Creating Interfaces"" data-pltdoc="x">← prev</a> <a href="mzlib_class.html" title="up to "6 Classes and Objects"" data-pltdoc="x">up</a> <a href="objcreation.html" title="forward to "6.3 Creating Objects"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-part-tag=""createclass"">6.2<tt> </tt><a name="(part._createclass)"></a>Creating Classes</h4><blockquote class="refpara"><blockquote class="refcolumn"><blockquote class="refcontent"><p><span class="imageleft"><img src="finger.png" alt="+" width="24" height="24"/></span><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=guide&rel=classes.html&version=6.1" class="Sq" data-pltdoc="x">Classes and Objects</a> in <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=guide&rel=index.html&version=6.1" class="Sq" data-pltdoc="x"><span style="font-weight: bold">The Racket Guide</span></a> introduces classes and objects.</p></blockquote></blockquote></blockquote><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>value</p></div></div><p class="RForeground"><a name="(def._((lib._racket/private/class-internal..rkt)._object~25))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValDef RktValLink" data-pltdoc="x">object%</a></span></span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class~3f%29%29" class="RktValLink" data-pltdoc="x">class?</a></span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">A built-in class that has no methods fields, implements only its own
interface <span class="RktPn">(</span><span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class-~3einterface%29%29" class="RktValLink" data-pltdoc="x">class->interface</a></span><span class="stt"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span><span class="RktPn">)</span>, and is transparent
(i.e,. its inspector is <span class="RktVal">#f</span>, so all immediate instances are
<span class="RktSym"><a href="booleans.html#%28def._%28%28quote._~23~25kernel%29._equal~3f%29%29" class="RktValLink" data-pltdoc="x">equal?</a></span>). All other classes are derived from <span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><table cellspacing="0" cellpadding="0" class="RktBlk RForeground"><tr><td><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._class*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">class*</a></span></span><span class="hspace"> </span><span class="RktVar">superclass-expr</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">interface-expr</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">class-clause</span></td></tr><tr><td><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr></table></blockquote></td></tr><tr><td><span class="stt"> </span></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="specgrammar"><tr><td align="right" valign="baseline"><span class="RktVar">class-clause</span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">=</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inspect%29%29" class="RktStxLink" data-pltdoc="x">inspect</a></span><span class="hspace"> </span><span class="RktVar">inspector-expr</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init%29%29" class="RktStxLink" data-pltdoc="x">init</a></span><span class="hspace"> </span><span class="RktVar">init-decl</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span><span class="hspace"> </span><span class="RktVar">init-decl</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._field%29%29" class="RktStxLink" data-pltdoc="x">field</a></span><span class="hspace"> </span><span class="RktVar">field-decl</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="RktStxLink" data-pltdoc="x">inherit-field</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="RktStxLink" data-pltdoc="x">init-rest</a></span><span class="hspace"> </span><span class="RktVar">id</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="RktStxLink" data-pltdoc="x">init-rest</a></span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%29%29" class="RktStxLink" data-pltdoc="x">private</a></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._abstract%29%29" class="RktStxLink" data-pltdoc="x">abstract</a></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="RktStxLink" data-pltdoc="x">inherit</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="RktStxLink" data-pltdoc="x">inherit/super</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="RktStxLink" data-pltdoc="x">inherit/inner</a></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="RktStxLink" data-pltdoc="x">rename-super</a></span><span class="hspace"> </span><span class="RktVar">renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-inner%29%29" class="RktStxLink" data-pltdoc="x">rename-inner</a></span><span class="hspace"> </span><span class="RktVar">renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktVar">method-definition</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktVar">definition</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktVar">expr</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="hspace"> </span><span class="RktVar">class-clause</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td></tr><tr><td align="right" valign="baseline"><span class="RktVar">init-decl</span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">=</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktVar">id</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktVar">renamed</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktVar">default-value-expr</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td></tr><tr><td align="right" valign="baseline"><span class="RktVar">field-decl</span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">=</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktVar">default-value-expr</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td></tr><tr><td align="right" valign="baseline"><span class="RktVar">maybe-renamed</span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">=</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktVar">id</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktVar">renamed</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td></tr><tr><td align="right" valign="baseline"><span class="RktVar">renamed</span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">=</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktVar">internal-id</span><span class="hspace"> </span><span class="RktVar">external-id</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td></tr><tr><td align="right" valign="baseline"><span class="RktVar">method-definition</span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">=</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28quote._~23~25kernel%29._define-values%29%29" class="RktStxLink" data-pltdoc="x">define-values</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">method-procedure</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td></tr><tr><td align="right" valign="baseline"><span class="RktVar">method-procedure</span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">=</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._lambda%29%29" class="RktStxLink" data-pltdoc="x">lambda</a></span><span class="hspace"> </span><span class="RktVar">kw-formals</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="lambda.html#%28form._%28%28quote._~23~25kernel%29._case-lambda%29%29" class="RktStxLink" data-pltdoc="x">case-lambda</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">formals</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="RktPn">(</span><span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~23~25plain-lambda%29%29" class="RktStxLink" data-pltdoc="x">#%plain-lambda</a></span><span class="hspace"> </span><span class="RktVar">formals</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="let.html#%28form._%28%28quote._~23~25kernel%29._let-values%29%29" class="RktStxLink" data-pltdoc="x">let-values</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktVar">id</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">method-procedure</span><span class="RktPn">]</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">method-procedure</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="let.html#%28form._%28%28quote._~23~25kernel%29._letrec-values%29%29" class="RktStxLink" data-pltdoc="x">letrec-values</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktVar">id</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">method-procedure</span><span class="RktPn">]</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">method-procedure</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="let.html#%28form._%28%28quote._~23~25kernel%29._let-values%29%29" class="RktStxLink" data-pltdoc="x">let-values</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktVar">id</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">method-procedure</span><span class="RktPn">]</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">id</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td align="right" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="center" valign="baseline">|</td><td align="left" valign="baseline"><span class="stt"> </span></td><td align="left" valign="baseline"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="let.html#%28form._%28%28quote._~23~25kernel%29._letrec-values%29%29" class="RktStxLink" data-pltdoc="x">letrec-values</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktVar">id</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">method-procedure</span><span class="RktPn">]</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">id</span><span class="RktPn">)</span></td></tr></table></td></tr></table></td></tr></table></blockquote></div><div class="SIntrapara">Produces a class value.</div></p><p>The <span class="RktVar">superclass-expr</span> expression is evaluated when the
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> expression is evaluated. The result must be a class
value (possibly <span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span>), otherwise the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised. The result of the
<span class="RktVar">superclass-expr</span> expression is the new class’s superclass.</p><p>The <span class="RktVar">interface-expr</span> expressions are also evaluated when the
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> expression is evaluated, after
<span class="RktVar">superclass-expr</span> is evaluated. The result of each
<span class="RktVar">interface-expr</span> must be an interface value, otherwise the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised. The interfaces returned by the
<span class="RktVar">interface-expr</span>s are all implemented by the class. For each
identifier in each interface, the class (or one of its ancestors) must
declare a public method with the same name, otherwise the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised. The class’s superclass must satisfy the
implementation requirement of each interface, otherwise the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised.</p><p>An <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inspect%29%29" class="RktStxLink" data-pltdoc="x">inspect</a></span> <span class="RktVar">class-clause</span> selects an inspector (see
<a href="inspectors.html" data-pltdoc="x">Structure Inspectors</a>) for the class extension. The
<span class="RktVar">inspector-expr</span> must evaluate to an inspector or <span class="RktVal">#f</span>
when the <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is evaluated. Just as for structure
types, an inspector controls access to the class’s fields, including
private fields, and also affects comparisons using <span class="RktSym"><a href="booleans.html#%28def._%28%28quote._~23~25kernel%29._equal~3f%29%29" class="RktValLink" data-pltdoc="x">equal?</a></span>. If
no <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inspect%29%29" class="RktStxLink" data-pltdoc="x">inspect</a></span> clause is provided, access to the class is
controlled by the parent of the current inspector (see
<a href="inspectors.html" data-pltdoc="x">Structure Inspectors</a>). A syntax error is reported if more than one
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inspect%29%29" class="RktStxLink" data-pltdoc="x">inspect</a></span> clause is specified.</p><p>The other <span class="RktVar">class-clause</span>s define initialization arguments,
public and private fields, and public and private methods. For each
<span class="RktVar">id</span> or <span class="RktVar">maybe-renamed</span> in a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span>, or <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%29%29" class="RktStxLink" data-pltdoc="x">private</a></span>
clause, there must be one <span class="RktVar">method-definition</span>. All other
definition <span class="RktVar">class-clause</span>s create private fields. All remaining
<span class="RktVar">expr</span>s are initialization expressions to be evaluated when the
class is instantiated (see <a href="objcreation.html" data-pltdoc="x">Creating Objects</a>).</p><p>The result of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> expression is a new class, derived
from the specified superclass and implementing the specified
interfaces. Instances of the class are created with the
<span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._instantiate%29%29" class="RktStxLink" data-pltdoc="x">instantiate</a></span> form or <span class="RktSym"><a href="objcreation.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._make-object%29%29" class="RktValLink" data-pltdoc="x">make-object</a></span> procedure, as
described in <a href="objcreation.html" data-pltdoc="x">Creating Objects</a>.</p><p>Each <span class="RktVar">class-clause</span> is (partially) macro-expanded to reveal its
shapes. If a <span class="RktVar">class-clause</span> is a <span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span> expression, its
sub-expressions are lifted out of the <span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span> and treated as
<span class="RktVar">class-clause</span>s, in the same way that <span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span> is
flattened for top-level and embedded definitions.</p><p>Within a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form for instances of the new class,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this%29%29" class="RktStxLink" data-pltdoc="x">this</a></span> is bound to the object itself;
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this~25%29%29" class="RktStxLink" data-pltdoc="x">this%</a></span> is bound to the class of the object;
<span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-instantiate%29%29" class="RktStxLink" data-pltdoc="x">super-instantiate</a></span>, <span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-make-object%29%29" class="RktStxLink" data-pltdoc="x">super-make-object</a></span>, and
<span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span> are bound to forms to initialize fields in the
superclass (see <a href="objcreation.html" data-pltdoc="x">Creating Objects</a>); <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxLink" data-pltdoc="x">super</a></span> is
available for calling superclass methods (see
<a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>); and <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxLink" data-pltdoc="x">inner</a></span> is available for
calling subclass augmentations of methods (see
<a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>).</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._class))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">class</a></span></span><span class="hspace"> </span><span class="RktVar">superclass-expr</span><span class="hspace"> </span><span class="RktVar">class-clause</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span>, but omits the <span class="RktVar">interface-expr</span>s, for the case that none are needed.</div></p><p><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Example:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">book-class%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._field%29%29" class="RktStxLink" data-pltdoc="x">field</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">pages</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">letters</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="generic-numbers.html#%28def._%28%28quote._~23~25kernel%29._%2A%29%29" class="RktValLink" data-pltdoc="x">*</a></span><span class="hspace"> </span><span class="RktSym">pages</span><span class="hspace"> </span><span class="RktVal">500</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr></table></blockquote></td></tr></table></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/private/class-internal..rkt)._this))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">this</a></span></span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara"><a name="(idx._(gentag._169._(lib._scribblings/reference/reference..scrbl)))"></a>Within a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this%29%29" class="RktStxLink" data-pltdoc="x">this</a></span> refers
to the current object (i.e., the object being initialized or whose
method was called). Use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is
a syntax error.</div></p><p><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">describe</span><span class="hspace"> </span><span class="RktSym">obj</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28quote._~23~25kernel%29._printf%29%29" class="RktValLink" data-pltdoc="x">printf</a></span><span class="hspace"> </span><span class="RktVal">"Hello ~a\n"</span><span class="hspace"> </span><span class="RktSym">obj</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">table%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">describe-self</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">describe</span><span class="hspace"> </span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this%29%29" class="RktStxLink" data-pltdoc="x">this</a></span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">table%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">describe-self</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktOut">Hello #(struct:object:table% ...)</span></p></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr></table></blockquote></td></tr></table></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><a name="(form._((lib._racket/private/class-internal..rkt)._this~25))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this~25%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">this%</a></span></span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Within a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this~25%29%29" class="RktStxLink" data-pltdoc="x">this%</a></span> refers to the class
of the current object (i.e., the object being initialized or whose
method was called). Use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is
a syntax error.</div></p><p><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">account%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span><span class="hspace"> </span><span class="RktSym">balance</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">add</span><span class="hspace"> </span><span class="RktSym">n</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this~25%29%29" class="RktStxLink" data-pltdoc="x">this%</a></span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">balance</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="generic-numbers.html#%28def._%28%28quote._~23~25kernel%29._%2B%29%29" class="RktValLink" data-pltdoc="x">+</a></span><span class="hspace"> </span><span class="RktSym">n</span><span class="hspace"> </span><span class="RktSym">balance</span><span class="RktPn">)</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">savings%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">account%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="RktStxLink" data-pltdoc="x">inherit-field</a></span><span class="hspace"> </span><span class="RktSym">balance</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">interest</span><span class="hspace"> </span><span class="RktVal">0.04</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">add-interest</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this%29%29" class="RktStxLink" data-pltdoc="x">this</a></span><span class="hspace"> </span><span class="RktSym">add</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="generic-numbers.html#%28def._%28%28quote._~23~25kernel%29._%2A%29%29" class="RktValLink" data-pltdoc="x">*</a></span><span class="hspace"> </span><span class="RktSym">interest</span><span class="hspace"> </span><span class="RktSym">balance</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._let%2A%29%29" class="RktStxLink" data-pltdoc="x">let*</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktSym">acct</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">savings%</span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">balance</span><span class="hspace"> </span><span class="RktVal">500</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">acct</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktSym">acct</span><span class="hspace"> </span><span class="RktSym">add</span><span class="hspace"> </span><span class="RktVal">500</span><span class="RktPn">)</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">acct</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktSym">acct</span><span class="hspace"> </span><span class="RktSym">add-interest</span><span class="RktPn">)</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28quote._~23~25kernel%29._printf%29%29" class="RktValLink" data-pltdoc="x">printf</a></span><span class="hspace"> </span><span class="RktVal">"Current balance: ~a\n"</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._get-field%29%29" class="RktStxLink" data-pltdoc="x">get-field</a></span><span class="hspace"> </span><span class="RktSym">balance</span><span class="hspace"> </span><span class="RktSym">acct</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><p><span class="RktOut">Current balance: 1040.0</span></p></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr></table></blockquote></td></tr></table></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._inspect))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inspect%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">inspect</a></span></span><span class="hspace"> </span><span class="RktVar">inspector-expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._init))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">init</a></span></span><span class="hspace"> </span><span class="RktVar">init-decl</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clinitvars%29" data-pltdoc="x">Initialization Variables</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Example:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init%29%29" class="RktStxLink" data-pltdoc="x">init</a></span><span class="hspace"> </span><span class="RktSym">turnip</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktSym">internal-potato</span><span class="hspace"> </span><span class="RktSym">potato</span><span class="RktPn">)</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">carrot</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">good</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktSym">internal-rutabaga</span><span class="hspace"> </span><span class="RktSym">rutabaga</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">okay</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><p><span class="RktRes">#<class:eval:10:0></span></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._init-field))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">init-field</a></span></span><span class="hspace"> </span><span class="RktVar">init-decl</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span>, <a href="#%28part._clinitvars%29" data-pltdoc="x">Initialization Variables</a>, and <a href="#%28part._clfields%29" data-pltdoc="x">Fields</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Example:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span><span class="hspace"> </span><span class="RktSym">turkey</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktSym">internal-ostrich</span><span class="hspace"> </span><span class="RktSym">ostrich</span><span class="RktPn">)</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">chicken</span><span class="hspace"> </span><span class="RktVal">7</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktSym">internal-emu</span><span class="hspace"> </span><span class="RktSym">emu</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">13</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><p><span class="RktRes">#<class:eval:11:0></span></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._field))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._field%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">field</a></span></span><span class="hspace"> </span><span class="RktVar">field-decl</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clfields%29" data-pltdoc="x">Fields</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Example:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._field%29%29" class="RktStxLink" data-pltdoc="x">field</a></span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">minestrone</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">ready</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktSym">internal-coq-au-vin</span><span class="hspace"> </span><span class="RktSym">coq-au-vin</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">stewing</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><p><span class="RktRes">#<class:eval:12:0></span></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._inherit-field))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">inherit-field</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clfields%29" data-pltdoc="x">Fields</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">cookbook%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._field%29%29" class="RktStxLink" data-pltdoc="x">field</a></span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">recipes</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">caldo-verde</span><span class="hspace"> </span><span class="RktVal">oyakodon</span><span class="hspace"> </span><span class="RktVal">eggs-benedict</span><span class="RktVal">)</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">pages</span><span class="hspace"> </span><span class="RktVal">389</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">cookbook%</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="RktStxLink" data-pltdoc="x">inherit-field</a></span><span class="hspace"> </span><span class="RktSym">recipes</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">internal-pages</span><span class="hspace"> </span><span class="RktSym">pages</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><p><span class="RktRes">#<class:eval:14:0></span></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._init-rest))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">init-rest</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">init-rest</a></span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clinitvars%29" data-pltdoc="x">Initialization Variables</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">fruit-basket%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="RktStxLink" data-pltdoc="x">init-rest</a></span><span class="hspace"> </span><span class="RktSym">fruits</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktSym">fruits</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._make-object%29%29" class="RktValLink" data-pltdoc="x">make-object</a></span><span class="hspace"> </span><span class="RktSym">fruit-basket%</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">kiwi</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">lychee</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">melon</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktOut">(kiwi lychee melon)</span></p></td></tr><tr><td><p><span class="RktRes">(object:fruit-basket% ...)</span></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._public))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">public</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">jumper%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">skip</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">skip</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">hop</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">hop</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span><span class="hspace"> </span><span class="RktSym">skip</span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">hop</span><span class="hspace"> </span><span class="RktSym">jump</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">jumper%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">skip</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktRes">'skip</span></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">jumper%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">jump</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktRes">'hop</span></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._pubment))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">pubment</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">runner%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">run</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">run</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">trot</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">trot</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span><span class="hspace"> </span><span class="RktSym">run</span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">trot</span><span class="hspace"> </span><span class="RktSym">jog</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">runner%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">run</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktRes">'run</span></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">runner%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">jog</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktRes">'trot</span></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._public-final))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">public-final</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">point%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">]</span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">y</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">get-x</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">x</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">do-get-y</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">y</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span><span class="hspace"> </span><span class="RktSym">get-x</span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">do-get-y</span><span class="hspace"> </span><span class="RktSym">get-y</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">point%</span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">]</span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">y</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">get-y</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktRes">3</span></p></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">point%</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">get-x</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3.14</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span><span class="hspace"> </span><span class="RktSym">get-x</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><p><span class="RktErr">class*: cannot override or augment final method</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">method name: get-x</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">class name: eval:25:0</span></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._override))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">override</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">sheep%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">bleat</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktVal">"baaaaaaaaah"</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">confused-sheep%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">sheep%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">bleat</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxLink" data-pltdoc="x">super</a></span><span class="hspace"> </span><span class="RktSym">bleat</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktVal">"???"</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span><span class="hspace"> </span><span class="RktSym">bleat</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">sheep%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">bleat</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktOut">baaaaaaaaah</span></p></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">confused-sheep%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">bleat</span><span class="RktPn">)</span></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td><p><span class="RktOut">baaaaaaaaah</span></p></td></tr><tr><td><p><span class="RktOut">???</span></p></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._overment))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">overment</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">turkey%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">gobble</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktVal">"gobble gobble"</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">extra-turkey%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">turkey%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">gobble</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxLink" data-pltdoc="x">super</a></span><span class="hspace"> </span><span class="RktSym">gobble</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktVal">"gobble gobble gobble"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxLink" data-pltdoc="x">inner</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="void.html#%28def._%28%28quote._~23~25kernel%29._void%29%29" class="RktValLink" data-pltdoc="x">void</a></span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">gobble</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span><span class="hspace"> </span><span class="RktSym">gobble</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">cyborg-turkey%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">extra-turkey%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Faugment%29%29" class="RktStxLink" data-pltdoc="x">define/augment</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">gobble</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktVal">"110011111011111100010110001011011001100101"</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">extra-turkey%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">gobble</span><span class="RktPn">)</span></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td><p><span class="RktOut">gobble gobble</span></p></td></tr><tr><td><p><span class="RktOut">gobble gobble gobble</span></p></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">cyborg-turkey%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">gobble</span><span class="RktPn">)</span></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td><p><span class="RktOut">gobble gobble</span></p></td></tr><tr><td><p><span class="RktOut">gobble gobble gobble</span></p></td></tr><tr><td><p><span class="RktOut">110011111011111100010110001011011001100101</span></p></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._override-final))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">override-final</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">meeper%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">meep</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktVal">"meep"</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">final-meeper%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">meeper%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">meep</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxLink" data-pltdoc="x">super</a></span><span class="hspace"> </span><span class="RktSym">meep</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktVal">"This meeping ends with me"</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span><span class="hspace"> </span><span class="RktSym">meep</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">meeper%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">meep</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktOut">meep</span></p></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">final-meeper%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">meep</span><span class="RktPn">)</span></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td><p><span class="RktOut">meep</span></p></td></tr><tr><td><p><span class="RktOut">This meeping ends with me</span></p></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._augment))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">augment</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">buzzer%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpubment%29%29" class="RktStxLink" data-pltdoc="x">define/pubment</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">buzz</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktVal">"bzzzt"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxLink" data-pltdoc="x">inner</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="void.html#%28def._%28%28quote._~23~25kernel%29._void%29%29" class="RktValLink" data-pltdoc="x">void</a></span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">buzz</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">loud-buzzer%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">buzzer%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">buzz</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktVal">"BZZZZZZZZZT"</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span><span class="hspace"> </span><span class="RktSym">buzz</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">buzzer%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">buzz</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktOut">bzzzt</span></p></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">loud-buzzer%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">buzz</span><span class="RktPn">)</span></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td><p><span class="RktOut">bzzzt</span></p></td></tr><tr><td><p><span class="RktOut">BZZZZZZZZZT</span></p></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._augride))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">augride</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._augment-final))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">augment-final</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._private))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">private</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">light%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">on?</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">toggle</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="set_.html#%28form._%28%28quote._~23~25kernel%29._set%21%29%29" class="RktStxLink" data-pltdoc="x">set!</a></span><span class="hspace"> </span><span class="RktSym">on?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="booleans.html#%28def._%28%28quote._~23~25kernel%29._not%29%29" class="RktValLink" data-pltdoc="x">not</a></span><span class="hspace"> </span><span class="RktSym">on?</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%29%29" class="RktStxLink" data-pltdoc="x">private</a></span><span class="hspace"> </span><span class="RktSym">toggle</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">flick</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">toggle</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span><span class="hspace"> </span><span class="RktSym">flick</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">light%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">toggle</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktErr">send: no such method</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">method name: toggle</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">class name: light%</span></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">light%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">flick</span><span class="RktPn">)</span></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._abstract))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._abstract%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">abstract</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._clmethoddefs%29" data-pltdoc="x">Method Definitions</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">train%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._abstract%29%29" class="RktStxLink" data-pltdoc="x">abstract</a></span><span class="hspace"> </span><span class="RktSym">get-speed</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">position</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">move</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._this~25%29%29" class="RktStxLink" data-pltdoc="x">this%</a></span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">position</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="generic-numbers.html#%28def._%28%28quote._~23~25kernel%29._%2B%29%29" class="RktValLink" data-pltdoc="x">+</a></span><span class="hspace"> </span><span class="RktSym">position</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">get-speed</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">acela%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">train%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverride%29%29" class="RktStxLink" data-pltdoc="x">define/override</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">get-speed</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">241</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">talgo-350%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">train%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverride%29%29" class="RktStxLink" data-pltdoc="x">define/override</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">get-speed</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">330</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">train%</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktErr">instantiate: cannot instantiate class with abstract methods</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">class: #<class:train%></span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">abstract methods:</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">get-speed</span></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">acela%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">move</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktRes">(object:acela% ...)</span></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._inherit))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">inherit</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._classinherit%29" data-pltdoc="x">Inherited and Superclass Methods</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">alarm%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">alarm</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="Writing.html#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._displayln%29%29" class="RktValLink" data-pltdoc="x">displayln</a></span><span class="hspace"> </span><span class="RktVal">"beeeeeeeep"</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">car-alarm%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym">alarm%</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span><span class="hspace"> </span><span class="RktSym">proximity</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="RktStxLink" data-pltdoc="x">inherit</a></span><span class="hspace"> </span><span class="RktSym">alarm</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="when_unless.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._when%29%29" class="RktStxLink" data-pltdoc="x">when</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="generic-numbers.html#%28def._%28%28quote._~23~25kernel%29._~3c%29%29" class="RktValLink" data-pltdoc="x"><</a></span><span class="hspace"> </span><span class="RktSym">proximity</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">alarm</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">car-alarm%</span><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">proximity</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktOut">beeeeeeeep</span></p></td></tr><tr><td><p><span class="RktRes">(object:car-alarm% ...)</span></p></td></tr></table></blockquote></td></tr></table></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._inherit/super))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">inherit/super</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._classinherit%29" data-pltdoc="x">Inherited and Superclass Methods</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._inherit/inner))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">inherit/inner</a></span></span><span class="hspace"> </span><span class="RktVar">maybe-renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._classinherit%29" data-pltdoc="x">Inherited and Superclass Methods</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._rename-super))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">rename-super</a></span></span><span class="hspace"> </span><span class="RktVar">renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._classinherit%29" data-pltdoc="x">Inherited and Superclass Methods</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._rename-inner))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-inner%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">rename-inner</a></span></span><span class="hspace"> </span><span class="RktVar">renamed</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">See <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> and <a href="#%28part._classinherit%29" data-pltdoc="x">Inherited and Superclass Methods</a>; use outside the body of a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> form is a syntax error.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._public*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">public*</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span>.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._pubment*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">pubment*</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span>.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._public-final*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">public-final*</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span>.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._override*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">override*</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span>.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._overment*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">overment*</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span>.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._override-final*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">override-final*</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span>.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._augment*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">augment*</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span>.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._augride*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">augride*</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span>.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._augment-final*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">augment-final*</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span>.</div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._private*))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%2A%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">private*</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%29%29" class="RktStxLink" data-pltdoc="x">private</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktMeta"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define/public))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/public</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">body</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="RktPn">)</span> or <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="stt"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktVar">body</span><span class="stt"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="RktPn">)</span></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define/pubment))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpubment%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/pubment</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpubment%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/pubment</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">body</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="RktPn">)</span> or <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="stt"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktVar">body</span><span class="stt"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="RktPn">)</span></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define/public-final))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic-final%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/public-final</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic-final%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/public-final</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">body</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="RktPn">)</span> or <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="stt"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktVar">body</span><span class="stt"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="RktPn">)</span></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define/override))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverride%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/override</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverride%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/override</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">body</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="RktPn">)</span> or <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="stt"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktVar">body</span><span class="stt"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="RktPn">)</span></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define/overment))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverment%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/overment</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverment%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/overment</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">body</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="RktPn">)</span> or <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="stt"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktVar">body</span><span class="stt"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="RktPn">)</span></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define/override-final))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverride-final%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/override-final</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Foverride-final%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/override-final</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">body</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="RktPn">)</span> or <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="stt"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktVar">body</span><span class="stt"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="RktPn">)</span></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define/augment))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Faugment%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/augment</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Faugment%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/augment</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">body</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="RktPn">)</span> or <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="stt"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktVar">body</span><span class="stt"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="RktPn">)</span></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define/augride))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Faugride%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/augride</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Faugride%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/augride</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">body</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="RktPn">)</span> or <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="stt"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktVar">body</span><span class="stt"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="RktPn">)</span></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define/augment-final))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Faugment-final%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/augment-final</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Faugment-final%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/augment-final</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">body</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="RktPn">)</span> or <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="stt"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktVar">body</span><span class="stt"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="RktPn">)</span></div><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define/private))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fprivate%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/private</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fprivate%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/private</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">body</span><span class="hspace"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Shorthand for <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%29%29" class="RktStxLink" data-pltdoc="x">private</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="stt"> </span><span class="RktVar">expr</span><span class="RktPn">)</span><span class="RktPn">)</span> or <span class="RktPn">(</span><span class="RktSym"><a href="begin.html#%28form._%28%28quote._~23~25kernel%29._begin%29%29" class="RktStxLink" data-pltdoc="x">begin</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%29%29" class="RktStxLink" data-pltdoc="x">private</a></span><span class="stt"> </span><span class="RktVar">id</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="stt"> </span><span class="RktPn">. </span><span class="RktVar">formals</span><span class="RktPn">)</span><span class="stt"> </span><span class="RktVar">body</span><span class="stt"> </span><span class="RktMeta">...+</span><span class="RktPn">)</span><span class="RktPn">)</span></div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><table cellspacing="0" cellpadding="0" class="RktBlk RForeground"><tr><td><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._class/derived))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2Fderived%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">class/derived</a></span></span><span class="hspace"> </span><span class="RktVar">original-datum</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">name-id</span><span class="hspace"> </span><span class="RktVar">super-expr</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">interface-expr</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">deserialize-id-expr</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">class-clause</span></td></tr><tr><td><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></td></tr></table></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span>, but includes a sub-expression to be used as the
source for all syntax errors within the class definition. For example,
<span class="RktSym"><a href="objectserialize.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-serializable-class%29%29" class="RktStxLink" data-pltdoc="x">define-serializable-class</a></span> expands to <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2Fderived%29%29" class="RktStxLink" data-pltdoc="x">class/derived</a></span>
so that errors in the body of the class are reported in terms of
<span class="RktSym"><a href="objectserialize.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-serializable-class%29%29" class="RktStxLink" data-pltdoc="x">define-serializable-class</a></span> instead of <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span>.</div></p><p>The <span class="RktVar">original-datum</span> is the original expression to use for
reporting errors.</p><p>The <span class="RktVar">name-id</span> is used to name the resulting class; if it
is <span class="RktVal">#f</span>, the class name is inferred.</p><p>The <span class="RktVar">super-expr</span>, <span class="RktVar">interface-expr</span>s, and
<span class="RktVar">class-clause</span>s are as for <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span>.</p><p>If the <span class="RktVar">deserialize-id-expr</span> is not literally <span class="RktVal">#f</span>, then
a serializable class is generated, and the result is two values
instead of one: the class and a deserialize-info structure produced by
<span class="RktSym">make-deserialize-info</span>. The <span class="RktVar">deserialize-id-expr</span>
should produce a value suitable as the second argument to
<span class="RktSym">make-serialize-info</span>, and it should refer to an export whose
value is the deserialize-info structure.</p><p>Future optional forms may be added to the sequence that currently ends
with <span class="RktVar">deserialize-id-expr</span>.</p><h5 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-part-tag=""clinitvars"">6.2.1<tt> </tt><a name="(part._clinitvars)"></a>Initialization Variables</h5><p>A class’s initialization variables, declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init%29%29" class="RktStxLink" data-pltdoc="x">init</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span>, and <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="RktStxLink" data-pltdoc="x">init-rest</a></span>, are instantiated
for each object of a class. Initialization variables can be used in
the initial value expressions of fields, default value expressions
for initialization arguments, and in initialization expressions. Only
initialization variables declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span> can be
accessed from methods; accessing any other initialization variable
from a method is a syntax error.</p><p>The values bound to initialization variables are</p><ul><li><p>the arguments provided with <span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._instantiate%29%29" class="RktStxLink" data-pltdoc="x">instantiate</a></span> or passed to
<span class="RktSym"><a href="objcreation.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._make-object%29%29" class="RktValLink" data-pltdoc="x">make-object</a></span>, if the object is created as a direct instance
of the class; or,</p></li><li><p>the arguments passed to the superclass initialization form or
procedure, if the object is created as an instance of a derived
class.</p></li></ul><p>If an initialization argument is not provided for an initialization
variable that has an associated <span class="RktVar">default-value-expr</span>, then the
<span class="RktVar">default-value-expr</span> expression is evaluated to obtain a value
for the variable. A <span class="RktVar">default-value-expr</span> is only evaluated when
an argument is not provided for its variable. The environment of
<span class="RktVar">default-value-expr</span> includes all of the initialization
variables, all of the fields, and all of the methods of the class. If
multiple <span class="RktVar">default-value-expr</span>s are evaluated, they are
evaluated from left to right. Object creation and field initialization
are described in detail in <a href="objcreation.html" data-pltdoc="x">Creating Objects</a>.</p><p>If an initialization variable has no <span class="RktVar">default-value-expr</span>, then
the object creation or superclass initialization call must supply an
argument for the variable, otherwise the <span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised.</p><p>Initialization arguments can be provided by name or by position. The
external name of an initialization variable can be used with
<span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._instantiate%29%29" class="RktStxLink" data-pltdoc="x">instantiate</a></span> or with the superclass initialization form. Those
forms also accept by-position arguments. The <span class="RktSym"><a href="objcreation.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._make-object%29%29" class="RktValLink" data-pltdoc="x">make-object</a></span>
procedure and the superclass initialization procedure accept only
by-position arguments.</p><p>Arguments provided by position are converted into by-name arguments
using the order of <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init%29%29" class="RktStxLink" data-pltdoc="x">init</a></span> and <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span> clauses and
the order of variables within each clause. When an <span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._instantiate%29%29" class="RktStxLink" data-pltdoc="x">instantiate</a></span>
form provides both by-position and by-name arguments, the converted
arguments are placed before by-name arguments. (The order can be
significant; see also <a href="objcreation.html" data-pltdoc="x">Creating Objects</a>.)</p><p>Unless a class contains an <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="RktStxLink" data-pltdoc="x">init-rest</a></span> clause, when the number
of by-position arguments exceeds the number of declared initialization
variables, the order of variables in the superclass (and so on, up the
superclass chain) determines the by-name conversion.</p><p>If a class expression contains an <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="RktStxLink" data-pltdoc="x">init-rest</a></span> clause, there
must be only one, and it must be last. If it declares a variable, then
the variable receives extra by-position initialization arguments as a
list (similar to a dotted “rest argument” in a procedure). An
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="RktStxLink" data-pltdoc="x">init-rest</a></span> variable can receive by-position initialization
arguments that are left over from a by-name conversion for a derived
class. When a derived class’s superclass initialization provides even
more by-position arguments, they are prefixed onto the by-position
arguments accumulated so far.</p><p>If too few or too many by-position initialization arguments are
provided to an object creation or superclass initialization, then the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised. Similarly, if extra by-position arguments
are provided to a class with an <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-rest%29%29" class="RktStxLink" data-pltdoc="x">init-rest</a></span> clause, the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised.</p><p>Unused (by-name) arguments are to be propagated to the superclass, as
described in <a href="objcreation.html" data-pltdoc="x">Creating Objects</a>. Multiple initialization
arguments can use the same name if the class derivation contains
multiple declarations (in different classes) of initialization
variables with the name. See <a href="objcreation.html" data-pltdoc="x">Creating Objects</a> for further
details.</p><p>See also <a href="#%28part._extnames%29" data-pltdoc="x">Internal and External Names</a> for information about internal and
external names.</p><h5 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-part-tag=""clfields"">6.2.2<tt> </tt><a name="(part._clfields)"></a>Fields</h5><p>Each <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._field%29%29" class="RktStxLink" data-pltdoc="x">field</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span>, and non-method
<span class="RktSym"><a href="define.html#%28form._%28%28quote._~23~25kernel%29._define-values%29%29" class="RktStxLink" data-pltdoc="x">define-values</a></span> clause in a class declares one or more new
fields for the class. Fields declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._field%29%29" class="RktStxLink" data-pltdoc="x">field</a></span> or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span> are public. Public fields can be accessed and
mutated by subclasses using <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="RktStxLink" data-pltdoc="x">inherit-field</a></span>. Public fields are
also accessible outside the class via <span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class-field-accessor%29%29" class="RktStxLink" data-pltdoc="x">class-field-accessor</a></span>
and mutable via <span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class-field-mutator%29%29" class="RktStxLink" data-pltdoc="x">class-field-mutator</a></span> (see
<a href="ivaraccess.html" data-pltdoc="x">Field and Method Access</a>). Fields declared with <span class="RktSym"><a href="define.html#%28form._%28%28quote._~23~25kernel%29._define-values%29%29" class="RktStxLink" data-pltdoc="x">define-values</a></span>
are accessible only within the class.</p><p>A field declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span> is both a public field and
an initialization variable. See <a href="#%28part._clinitvars%29" data-pltdoc="x">Initialization Variables</a> for
information about initialization variables.</p><p>An <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="RktStxLink" data-pltdoc="x">inherit-field</a></span> declaration makes a public field defined by
a superclass directly accessible in the class expression. If the
indicated field is not defined in the superclass, the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised when the class expression is evaluated.
Every field in a superclass is present in a derived class, even if it
is not declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="RktStxLink" data-pltdoc="x">inherit-field</a></span> in the derived class. The
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="RktStxLink" data-pltdoc="x">inherit-field</a></span> clause does not control inheritance, but merely
controls lexical scope within a class expression.</p><p>When an object is first created, all of its fields have the
<a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=guide&rel=void_undefined.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="nobreak"><span class="RktRes">#<undefined></span></span></a> value (see <a href="void.html" data-pltdoc="x">Void</a>). The fields of a
class are initialized at the same time that the class’s initialization
expressions are evaluated; see <a href="objcreation.html" data-pltdoc="x">Creating Objects</a> for more
information.</p><p>See also <a href="#%28part._extnames%29" data-pltdoc="x">Internal and External Names</a> for information about internal and
external names.</p><h5 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-part-tag=""clmethods"">6.2.3<tt> </tt><a name="(part._clmethods)"></a>Methods</h5><h5 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-part-tag=""clmethoddefs"">6.2.3.1<tt> </tt><a name="(part._clmethoddefs)"></a>Method Definitions</h5><p>Each <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span>, and <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%29%29" class="RktStxLink" data-pltdoc="x">private</a></span>
clause in a class declares one or more method names. Each method name
must have a corresponding <span class="RktVar">method-definition</span>. The order of
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span>, etc<span class="Sendabbrev">.</span>, clauses and their corresponding definitions
(among themselves, and with respect to other clauses in the class)
does not matter.</p><p>As shown in the grammar for <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span>, a method definition is
syntactically restricted to certain procedure forms, as defined by the
grammar for <span class="RktVar">method-procedure</span>; in the last two forms of
<span class="RktVar">method-procedure</span>, the body <span class="RktSym">id</span> must be one of the
<span class="RktSym">id</span>s bound by <span class="RktSym"><a href="let.html#%28form._%28%28quote._~23~25kernel%29._let-values%29%29" class="RktStxLink" data-pltdoc="x">let-values</a></span> or <span class="RktSym"><a href="let.html#%28form._%28%28quote._~23~25kernel%29._letrec-values%29%29" class="RktStxLink" data-pltdoc="x">letrec-values</a></span>. A
<span class="RktVar">method-procedure</span> expression is not evaluated
directly. Instead, for each method, a class-specific method procedure
is created; it takes an initial object argument, in addition to the
arguments the procedure would accept if the <span class="RktVar">method-procedure</span>
expression were evaluated directly. The body of the procedure is
transformed to access methods and fields through the object argument.</p><p>A method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span>, or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span> introduces a new method into a class. The method
must not be present already in the superclass, otherwise the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised when the class expression is evaluated. A
method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span> can be overridden in a subclass
that uses <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span>, or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span>. A method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span> can
be augmented in a subclass that uses <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span>, or <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span>. A method declared with
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span> cannot be overridden or augmented in a subclass.</p><p>A method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span>, or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span> overrides a definition already present in the
superclass. If the method is not already present, the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised when the class expression is evaluated. A
method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span> can be overridden again in a
subclass that uses <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span>, or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span>. A method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span> can
be augmented in a subclass that uses <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span>, or <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span>. A method declared with
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span> cannot be overridden further or augmented in a
subclass.</p><p>A method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span>, or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span> augments a definition already present in the
superclass. If the method is not already present, the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised when the class expression is evaluated. A
method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span> can be augmented further in a
subclass that uses <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span>, or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span>. A method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span> can be
overridden in a subclass that uses <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span>, or <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span>. (Such an override
merely replaces the augmentation, not the method that is augmented.)
A method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span> cannot be overridden or
augmented further in a subclass.</p><p>A method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._private%29%29" class="RktStxLink" data-pltdoc="x">private</a></span> is not accessible outside the
class expression, cannot be overridden, and never overrides a method
in the superclass.</p><p>When a method is declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span>,
or <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span>, then the superclass implementation of the
method can be called using <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxLink" data-pltdoc="x">super</a></span> form.</p><p>When a method is declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span>, or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span>, then a subclass augmenting method can be called
using the <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxLink" data-pltdoc="x">inner</a></span> form. The only difference between
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span> and <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span> without a corresponding
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxLink" data-pltdoc="x">inner</a></span> is that <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span> prevents the declaration
of augmenting methods that would be ignored.</p><p>A method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._abstract%29%29" class="RktStxLink" data-pltdoc="x">abstract</a></span> must be declared without
an implementation. Subclasses may implement abstract methods via the
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span>, or <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span>
forms. Any class that contains or inherits any abstract methods is
considered abstract and cannot be instantiated.</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._super))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">super</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">arg</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">super</a></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">arg</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">arg-list-expr</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Always accesses the superclass method, independent of whether the
method is overridden again in subclasses. Using the <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxLink" data-pltdoc="x">super</a></span>
form outside of <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> is a syntax error. Each <span class="RktVar">arg</span>
is as for <span class="RktSym"><a href="application.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._~23~25app%29%29" class="RktStxLink" data-pltdoc="x">#%app</a></span>: either <span class="RktVar">arg-expr</span> or
<span class="RktVar">keyword</span><span class="stt"> </span><span class="RktVar">arg-expr</span>.</div></p><p>The second form is analogous to using <span class="RktSym"><a href="procedures.html#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._apply%29%29" class="RktValLink" data-pltdoc="x">apply</a></span> with a procedure;
the <span class="RktVar">arg-list-expr</span> must not be a parenthesized expression.</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._inner))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">inner</a></span></span><span class="hspace"> </span><span class="RktVar">default-expr</span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">arg</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">inner</a></span><span class="hspace"> </span><span class="RktVar">default-expr</span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">arg</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">arg-list-expr</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">If the object’s class does not supply an augmenting method, then
<span class="RktVar">default-expr</span> is evaluated, and the <span class="RktVar">arg</span> expressions
are not evaluated. Otherwise, the augmenting method is called with the
<span class="RktVar">arg</span> results as arguments, and <span class="RktVar">default-expr</span> is not
evaluated. If no <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxLink" data-pltdoc="x">inner</a></span> call is evaluated for a particular
method, then augmenting methods supplied by subclasses are never
used. Using the <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxLink" data-pltdoc="x">inner</a></span> form outside of <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%2A%29%29" class="RktStxLink" data-pltdoc="x">class*</a></span> is an
syntax error.</div></p><p>The second form is analogous to using <span class="RktSym"><a href="procedures.html#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._apply%29%29" class="RktValLink" data-pltdoc="x">apply</a></span> with a procedure;
the <span class="RktVar">arg-list-expr</span> must not be a parenthesized expression.</p><h5 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-part-tag=""classinherit"">6.2.3.2<tt> </tt><a name="(part._classinherit)"></a>Inherited and Superclass Methods</h5><p>Each <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="RktStxLink" data-pltdoc="x">inherit</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="RktStxLink" data-pltdoc="x">inherit/super</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="RktStxLink" data-pltdoc="x">inherit/inner</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="RktStxLink" data-pltdoc="x">rename-super</a></span>, and <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-inner%29%29" class="RktStxLink" data-pltdoc="x">rename-inner</a></span> clause declares one
or more methods that are defined in the class, but must be present in
the superclass. The <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="RktStxLink" data-pltdoc="x">rename-super</a></span> and <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-inner%29%29" class="RktStxLink" data-pltdoc="x">rename-inner</a></span>
declarations are rarely used, since <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="RktStxLink" data-pltdoc="x">inherit/super</a></span> and
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="RktStxLink" data-pltdoc="x">inherit/inner</a></span> provide the same access. Also, superclass and
augmenting methods are typically accessed through <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxLink" data-pltdoc="x">super</a></span> and
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxLink" data-pltdoc="x">inner</a></span> in a class that also declares the methods, instead of
through <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="RktStxLink" data-pltdoc="x">inherit/super</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="RktStxLink" data-pltdoc="x">inherit/inner</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="RktStxLink" data-pltdoc="x">rename-super</a></span>, or <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-inner%29%29" class="RktStxLink" data-pltdoc="x">rename-inner</a></span>.</p><p>Method names declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="RktStxLink" data-pltdoc="x">inherit</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="RktStxLink" data-pltdoc="x">inherit/super</a></span>,
or <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="RktStxLink" data-pltdoc="x">inherit/inner</a></span> access overriding declarations, if any, at
run time. Method names declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="RktStxLink" data-pltdoc="x">inherit/super</a></span> can also
be used with the <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxLink" data-pltdoc="x">super</a></span> form to access the superclass
implementation, and method names declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="RktStxLink" data-pltdoc="x">inherit/inner</a></span>
can also be used with the <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxLink" data-pltdoc="x">inner</a></span> form to access an augmenting
method, if any.</p><p>Method names declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="RktStxLink" data-pltdoc="x">rename-super</a></span> always access the
superclass’s implementation at run-time. Methods declared with
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-inner%29%29" class="RktStxLink" data-pltdoc="x">rename-inner</a></span> access a subclass’s augmenting method, if any,
and must be called with the form</p><blockquote class="SCodeFlow"><p><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._lambda%29%29" class="RktStxLink" data-pltdoc="x">lambda</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">default-expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVar">arg</span><span class="hspace"> </span><span class="RktSym"><a href="stx-patterns.html#%28form._%28%28lib._racket%2Fprivate%2Fstxcase-scheme..rkt%29._......%29%29" class="RktStxLink" data-pltdoc="x">...</a></span><span class="RktPn">)</span></p></blockquote><p>so that a <span class="RktSym">default-expr</span> is available to evaluate when no
augmenting method is available. In such a form, <span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._lambda%29%29" class="RktStxLink" data-pltdoc="x">lambda</a></span> is a
literal identifier to separate the <span class="RktSym">default-expr</span> from the
<span class="RktSym">arg</span>. When an augmenting method is available, it receives the
results of the <span class="RktSym">arg</span> expressions as arguments.</p><p>Methods that are present in the superclass but not declared with
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="RktStxLink" data-pltdoc="x">inherit</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="RktStxLink" data-pltdoc="x">inherit/super</a></span>, or <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="RktStxLink" data-pltdoc="x">inherit/inner</a></span> or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="RktStxLink" data-pltdoc="x">rename-super</a></span> are not directly accessible in the class
(though they can be called with <span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span>). Every public method
in a superclass is present in a derived class, even if it is not
declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="RktStxLink" data-pltdoc="x">inherit</a></span> in the derived class; the
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="RktStxLink" data-pltdoc="x">inherit</a></span> clause does not control inheritance, but merely
controls lexical scope within a class expression.</p><p>If a method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="RktStxLink" data-pltdoc="x">inherit</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="RktStxLink" data-pltdoc="x">inherit/super</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="RktStxLink" data-pltdoc="x">inherit/inner</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="RktStxLink" data-pltdoc="x">rename-super</a></span>, or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-inner%29%29" class="RktStxLink" data-pltdoc="x">rename-inner</a></span> is not present in the superclass, the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised when the class expression is evaluated.</p><h5 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-part-tag=""extnames"">6.2.3.3<tt> </tt><a name="(part._extnames)"></a>Internal and External Names</h5><p>Each method declared with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public%29%29" class="RktStxLink" data-pltdoc="x">public</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override%29%29" class="RktStxLink" data-pltdoc="x">override</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment%29%29" class="RktStxLink" data-pltdoc="x">augment</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._pubment%29%29" class="RktStxLink" data-pltdoc="x">pubment</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._overment%29%29" class="RktStxLink" data-pltdoc="x">overment</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augride%29%29" class="RktStxLink" data-pltdoc="x">augride</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._public-final%29%29" class="RktStxLink" data-pltdoc="x">public-final</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._override-final%29%29" class="RktStxLink" data-pltdoc="x">override-final</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._augment-final%29%29" class="RktStxLink" data-pltdoc="x">augment-final</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%29%29" class="RktStxLink" data-pltdoc="x">inherit</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Fsuper%29%29" class="RktStxLink" data-pltdoc="x">inherit/super</a></span>,
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit%2Finner%29%29" class="RktStxLink" data-pltdoc="x">inherit/inner</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="RktStxLink" data-pltdoc="x">rename-super</a></span>, and
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-inner%29%29" class="RktStxLink" data-pltdoc="x">rename-inner</a></span> can have separate internal and external names
when <span class="RktPn">(</span><span class="RktSym">internal-id</span><span class="stt"> </span><span class="RktSym">external-id</span><span class="RktPn">)</span> is used for declaring the
method. The internal name is used to access the method directly within
the class expression (including within <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super%29%29" class="RktStxLink" data-pltdoc="x">super</a></span> or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inner%29%29" class="RktStxLink" data-pltdoc="x">inner</a></span> forms), while the external name is used with
<span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span> and <span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._generic%29%29" class="RktStxLink" data-pltdoc="x">generic</a></span> (see <a href="ivaraccess.html" data-pltdoc="x">Field and Method Access</a>). If
a single <span class="RktSym">id</span> is provided for a method declaration, the
identifier is used for both the internal and external names.</p><p>Method inheritance, overriding, and augmentation are based on external
names only. Separate internal and external names are required for
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-super%29%29" class="RktStxLink" data-pltdoc="x">rename-super</a></span> and <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._rename-inner%29%29" class="RktStxLink" data-pltdoc="x">rename-inner</a></span> (for historical
reasons, mainly).</p><p>Each <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init%29%29" class="RktStxLink" data-pltdoc="x">init</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._init-field%29%29" class="RktStxLink" data-pltdoc="x">init-field</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._field%29%29" class="RktStxLink" data-pltdoc="x">field</a></span>, or
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="RktStxLink" data-pltdoc="x">inherit-field</a></span> variable similarly has an internal and an
external name. The internal name is used within the class to access
the variable, while the external name is used outside the class when
providing initialization arguments (e.g., to <span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._instantiate%29%29" class="RktStxLink" data-pltdoc="x">instantiate</a></span>),
inheriting a field, or accessing a field externally (e.g., with
<span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class-field-accessor%29%29" class="RktStxLink" data-pltdoc="x">class-field-accessor</a></span>). As for methods, when inheriting a
field with <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._inherit-field%29%29" class="RktStxLink" data-pltdoc="x">inherit-field</a></span>, the external name is matched to an
external field name in the superclass, while the internal name is
bound in the <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span> expression.</p><p>A single identifier can be used as an internal identifier and an
external identifier, and it is possible to use the same identifier as
internal and external identifiers for different bindings. Furthermore,
within a single class, a single name can be used as an external method
name, an external field name, and an external initialization argument
name. Overall, each internal identifier must be distinct from all
other internal identifiers, each external method name must be distinct
from all other method names, each external field name must be distinct
from all other field names, and each initialization argument name must
be distinct from all other initialization argument names.</p><p>By default, external names have no lexical scope, which means, for
example, that an external method name matches the same syntactic
symbol in all uses of <span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span>. The
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-local-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-local-member-name</a></span> and <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-member-name</a></span> forms
introduce scoped external names.</p><p>When a <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span> expression is compiled, identifiers used in
place of external names must be symbolically distinct (when the
corresponding external names are required to be distinct), otherwise a
syntax error is reported. When no external name is bound by
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-member-name</a></span>, then the actual external names are
guaranteed to be distinct when <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span> expression is evaluated.
When any external name is bound by <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-member-name</a></span>, the
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._exn~3afail~3aobject%29%29" class="RktValLink" data-pltdoc="x">exn:fail:object</a></span> exception is raised by <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span> if the actual external
names are not distinct.</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define-local-member-name))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-local-member-name%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define-local-member-name</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Unless it appears as the top-level definition, binds each <span class="RktVar">id</span>
so that, within the scope of the definition, each use of each
<span class="RktVar">id</span> as an external name is resolved to a hidden name generated
by the <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-local-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-local-member-name</a></span> declaration. Thus, methods,
fields, and initialization arguments declared with such external-name
<span class="RktVar">id</span>s are accessible only in the scope of the
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-local-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-local-member-name</a></span> declaration. As a top-level
definition, <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-local-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-local-member-name</a></span> binds <span class="RktVar">id</span> to its
symbolic form.</div></p><p>The binding introduced by <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-local-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-local-member-name</a></span> is a
syntax binding that can be exported and imported with
<span class="RktSym"><a href="module.html#%28form._%28%28quote._~23~25kernel%29._module%29%29" class="RktStxLink" data-pltdoc="x">module</a></span>s. Each evaluation of a
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-local-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-local-member-name</a></span> declaration generates a distinct
hidden name (except as a top-level definition). The
<span class="RktSym"><a href="objectutils.html#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._interface-~3emethod-names%29%29" class="RktValLink" data-pltdoc="x">interface->method-names</a></span> procedure does not expose hidden
names.</p><p><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28quote._~23~25kernel%29._define-values%29%29" class="RktStxLink" data-pltdoc="x">define-values</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">r</span><span class="hspace"> </span><span class="RktSym">o</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._let%29%29" class="RktStxLink" data-pltdoc="x">let</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-local-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-local-member-name</a></span><span class="hspace"> </span><span class="RktSym">m</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">c%</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">m</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">o</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">c%</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="values.html#%28def._%28%28quote._~23~25kernel%29._values%29%29" class="RktValLink" data-pltdoc="x">values</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktSym">o</span><span class="hspace"> </span><span class="RktSym">m</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">o</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktSym">r</span></td></tr><tr><td><p><span class="RktRes">10</span></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktSym">o</span><span class="hspace"> </span><span class="RktSym">m</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktErr">send: no such method</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">method name: m</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">class name: c%</span></p></td></tr></table></blockquote></td></tr></table></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._define-member-name))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-member-name%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define-member-name</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">key-expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Maps a single external name to an external name that is determined by
an expression. The value of <span class="RktVar">key-expr</span> must be the result of either a
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key%29%29" class="RktStxLink" data-pltdoc="x">member-name-key</a></span> expression or a <span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._generate-member-key%29%29" class="RktValLink" data-pltdoc="x">generate-member-key</a></span> call.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._racket/private/class-internal..rkt)._member-name-key))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">member-name-key</a></span></span><span class="hspace"> </span><span class="RktVar">identifier</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Produces a representation of the external name for <span class="RktSym">id</span> in the
environment of the <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key%29%29" class="RktStxLink" data-pltdoc="x">member-name-key</a></span> expression.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._racket/private/class-internal..rkt)._generate-member-key))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._generate-member-key%29%29" class="RktValDef RktValLink" data-pltdoc="x">generate-member-key</a></span></span><span class="RktPn"></span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key~3f%29%29" class="RktValLink" data-pltdoc="x">member-name-key?</a></span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Produces a hidden name, just like the binding for
<span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-local-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-local-member-name</a></span>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._racket/private/class-internal..rkt)._member-name-key~3f))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key~3f%29%29" class="RktValDef RktValLink" data-pltdoc="x">member-name-key?</a></span></span><span class="hspace"> </span><span class="RktVar">v</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="booleans.html#%28def._%28%28quote._~23~25kernel%29._boolean~3f%29%29" class="RktValLink" data-pltdoc="x">boolean?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">v</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="data-structure-contracts.html#%28def._%28%28lib._racket%2Fcontract%2Fprivate%2Fmisc..rkt%29._any%2Fc%29%29" class="RktValLink" data-pltdoc="x">any/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Returns <span class="RktVal">#t</span> for values produced by <span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key%29%29" class="RktStxLink" data-pltdoc="x">member-name-key</a></span>
and <span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._generate-member-key%29%29" class="RktValLink" data-pltdoc="x">generate-member-key</a></span>, <span class="RktVal">#f</span>
otherwise.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._racket/private/class-internal..rkt)._member-name-key~3d~3f))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key~3d~3f%29%29" class="RktValDef RktValLink" data-pltdoc="x">member-name-key=?</a></span></span><span class="hspace"> </span><span class="RktVar">a-key</span><span class="hspace"> </span><span class="RktVar">b-key</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="booleans.html#%28def._%28%28quote._~23~25kernel%29._boolean~3f%29%29" class="RktValLink" data-pltdoc="x">boolean?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">a-key</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key~3f%29%29" class="RktValLink" data-pltdoc="x">member-name-key?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">b-key</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key~3f%29%29" class="RktValLink" data-pltdoc="x">member-name-key?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Produces <span class="RktVal">#t</span> if member-name keys <span class="RktVar">a-key</span> and
<span class="RktVar">b-key</span> represent the same external name, <span class="RktVal">#f</span>
otherwise.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._racket/private/class-internal..rkt)._member-name-key-hash-code))"></a><span title="Provided from: racket/class, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key-hash-code%29%29" class="RktValDef RktValLink" data-pltdoc="x">member-name-key-hash-code</a></span></span><span class="hspace"> </span><span class="RktVar">a-key</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="number-types.html#%28def._%28%28quote._~23~25kernel%29._integer~3f%29%29" class="RktValLink" data-pltdoc="x">integer?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">a-key</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key~3f%29%29" class="RktValLink" data-pltdoc="x">member-name-key?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Produces an integer hash code consistent with
<span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key~3d~3f%29%29" class="RktValLink" data-pltdoc="x">member-name-key=?</a></span> comparisons, analogous to
<span class="RktSym"><a href="hashtables.html#%28def._%28%28quote._~23~25kernel%29._equal-hash-code%29%29" class="RktValLink" data-pltdoc="x">equal-hash-code</a></span>.</div></p><p><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><p>Examples:</p></td></tr><tr><td><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-c%</span><span class="hspace"> </span><span class="RktSym">key</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-member-name</a></span><span class="hspace"> </span><span class="RktSym">m</span><span class="hspace"> </span><span class="RktSym">key</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._class%29%29" class="RktStxLink" data-pltdoc="x">class</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._object~25%29%29" class="RktValLink" data-pltdoc="x">object%</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define%2Fpublic%29%29" class="RktStxLink" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">m</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._super-new%29%29" class="RktStxLink" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td> </td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0"><tr><td></td></tr></table></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-c%</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key%29%29" class="RktStxLink" data-pltdoc="x">member-name-key</a></span><span class="hspace"> </span><span class="RktSym">m</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">m</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktRes">10</span></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-c%</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key%29%29" class="RktStxLink" data-pltdoc="x">member-name-key</a></span><span class="hspace"> </span><span class="RktSym">p</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">m</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktErr">send: no such method</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">method name: m</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">class name: eval:57:0</span></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-c%</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._member-name-key%29%29" class="RktStxLink" data-pltdoc="x">member-name-key</a></span><span class="hspace"> </span><span class="RktSym">p</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">p</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktRes">10</span></p></td></tr></table></blockquote></td></tr></table></p><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0"><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._define%29%29" class="RktStxLink" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">fresh-c%</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._let%29%29" class="RktStxLink" data-pltdoc="x">let</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktSym">key</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._generate-member-key%29%29" class="RktValLink" data-pltdoc="x">generate-member-key</a></span><span class="RktPn">)</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="values.html#%28def._%28%28quote._~23~25kernel%29._values%29%29" class="RktValLink" data-pltdoc="x">values</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-c%</span><span class="hspace"> </span><span class="RktSym">key</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">key</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="define.html#%28form._%28%28quote._~23~25kernel%29._define-values%29%29" class="RktStxLink" data-pltdoc="x">define-values</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">fc%</span><span class="hspace"> </span><span class="RktSym">key</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">fresh-c%</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><p> </p></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">fc%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">m</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktErr">send: no such method</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">method name: m</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">class name: eval:57:0</span></p></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="let.html#%28form._%28%28lib._racket%2Fprivate%2Fletstx-scheme..rkt%29._let%29%29" class="RktStxLink" data-pltdoc="x">let</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._define-member-name%29%29" class="RktStxLink" data-pltdoc="x">define-member-name</a></span><span class="hspace"> </span><span class="RktSym">p</span><span class="hspace"> </span><span class="RktSym">key</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="ivaraccess.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._send%29%29" class="RktStxLink" data-pltdoc="x">send</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="objcreation.html#%28form._%28%28lib._racket%2Fprivate%2Fclass-internal..rkt%29._new%29%29" class="RktStxLink" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">fc%</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">p</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr><tr><td><p><span class="RktRes">10</span></p></td></tr></table></td></tr></table></blockquote><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="createinterface.html" title="backward to "6.1 Creating Interfaces"" data-pltdoc="x">← prev</a> <a 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