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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>12 Interface-Oriented Programming for Classes</title><link rel="stylesheet" type="text/css" href="../scribble.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">Unstable:<span class="mywbr"> </span> May Change Without Warning</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="guidelines.html" class="tocviewlink" data-pltdoc="x">Guidelines for Developing <span class="RktSym">unstable</span> Libraries</a></td></tr><tr><td align="right">2 </td><td><a href="Automata__Compiling_State_Machines.html" class="tocviewlink" data-pltdoc="x">Automata:<span class="mywbr"> </span> Compiling State Machines</a></td></tr><tr><td align="right">3 </td><td><a href="bytes.html" class="tocviewlink" data-pltdoc="x">Bytes</a></td></tr><tr><td align="right">4 </td><td><a href="contract.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">5 </td><td><a href="wrapc.html" class="tocviewlink" data-pltdoc="x">Contracts for Macro Subexpressions</a></td></tr><tr><td align="right">6 </td><td><a href="Debugging.html" class="tocviewlink" data-pltdoc="x">Debugging</a></td></tr><tr><td align="right">7 </td><td><a href="Definitions.html" class="tocviewlink" data-pltdoc="x">Definitions</a></td></tr><tr><td align="right">8 </td><td><a href="error.html" class="tocviewlink" data-pltdoc="x">Errors</a></td></tr><tr><td align="right">9 </td><td><a href="future.html" class="tocviewlink" data-pltdoc="x">Futures</a></td></tr><tr><td align="right">10 </td><td><a href="Functions.html" class="tocviewlink" data-pltdoc="x">Functions</a></td></tr><tr><td align="right">11 </td><td><a href="Hash_Tables.html" class="tocviewlink" data-pltdoc="x">Hash Tables</a></td></tr><tr><td align="right">12 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Interface-<wbr></wbr>Oriented Programming for Classes</a></td></tr><tr><td align="right">13 </td><td><a href="lazy-require.html" class="tocviewlink" data-pltdoc="x">Lazy Require</a></td></tr><tr><td align="right">14 </td><td><a href="list.html" class="tocviewlink" data-pltdoc="x">Lists</a></td></tr><tr><td align="right">15 </td><td><a href="Logging.html" class="tocviewlink" data-pltdoc="x">Logging</a></td></tr><tr><td align="right">16 </td><td><a href="macro-testing.html" class="tocviewlink" data-pltdoc="x">Macro Testing</a></td></tr><tr><td align="right">17 </td><td><a href="Mark_Parameters.html" class="tocviewlink" data-pltdoc="x">Mark Parameters</a></td></tr><tr><td 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href="sequence.html" class="tocviewlink" data-pltdoc="x">Sequences</a></td></tr><tr><td align="right">26 </td><td><a href="string.html" class="tocviewlink" data-pltdoc="x">Strings</a></td></tr><tr><td align="right">27 </td><td><a href="struct.html" class="tocviewlink" data-pltdoc="x">Structs</a></td></tr><tr><td align="right">28 </td><td><a href="custom-write.html" class="tocviewlink" data-pltdoc="x">Struct Printing</a></td></tr><tr><td align="right">29 </td><td><a href="syntax.html" class="tocviewlink" data-pltdoc="x">Syntax</a></td></tr><tr><td align="right">30 </td><td><a href="temp-c.html" class="tocviewlink" data-pltdoc="x">Temporal Contracts:<span class="mywbr"> </span> Explicit Contract Monitors</a></td></tr><tr><td align="right">31 </td><td><a href="unix-socket.html" class="tocviewlink" data-pltdoc="x">Unix Domain Sockets</a></td></tr><tr><td align="right">32 </td><td><a href="2d.html" class="tocviewlink" data-pltdoc="x">2D Syntax</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="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-<wbr></wbr>interface</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface%2Fdynamic%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-<wbr></wbr>interface/<span class="mywbr"> </span>dynamic</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fi%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">send/<span class="mywbr"> </span>i</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2A%2Fi%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">send*/<span class="mywbr"> </span>i</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fapply%2Fi%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">send/<span class="mywbr"> </span>apply/<span class="mywbr"> </span>i</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define%2Fi%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define/<span class="mywbr"> </span>i</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._init%2Fi%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">init/<span class="mywbr"> </span>i</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._init-field%2Fi%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">init-<wbr></wbr>field/<span class="mywbr"> </span>i</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._init-private%2Fi%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">init-<wbr></wbr>private/<span class="mywbr"> </span>i</span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface-expander%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-<wbr></wbr>interface-<wbr></wbr>expander</span></span></a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.1</span></div><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="Hash_Tables.html" title="backward to "11 Hash Tables"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Unstable: May Change Without Warning"" data-pltdoc="x">up</a> <a href="lazy-require.html" title="forward to "13 Lazy Require"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "unstable/scribblings/unstable.scrbl")" x-part-tag=""class-iop"">12<tt> </tt><a name="(part._class-iop)"></a><a name="(mod-path._unstable/class-iop)"></a>Interface-Oriented Programming for Classes</h3><div class="SAuthorListBox"><span class="SAuthorList"><p class="author">Ryan Culpepper <<a href="mailto:ryanc@racket-lang.org">ryanc@racket-lang.org</a>></p></span></div><p><div class="SIntrapara"></div><div class="SIntrapara">This library is <span style="font-style: italic">unstable</span>;
compatibility will not be maintained.
See <a href="index.html" data-pltdoc="x">Unstable: May Change Without Warning</a>
for more information.</div></p><p><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">unstable/class-iop</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">unstable-list-lib</span></span></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._unstable/class-iop..rkt)._define-interface))"></a><span title="Provided from: unstable/class-iop | Package: unstable-list-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define-interface</a></span></span><span class="hspace"> </span><span class="RktVar">name-id</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">super-ifc-id</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">method-id</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Defines <span class="RktVar">name-id</span> as a static interface extending the
interfaces named by the <span class="RktVar">super-ifc-id</span>s and containing the
methods specified by the <span class="RktVar">method-id</span>s.</div></p><p>A static interface name is used by the checked method call variants
(<span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fi%29%29" class="RktStxLink" data-pltdoc="x">send/i</a></span>, <span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2A%2Fi%29%29" class="RktStxLink" data-pltdoc="x">send*/i</a></span>, and <span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fapply%2Fi%29%29" class="RktStxLink" data-pltdoc="x">send/apply/i</a></span>). When
used as an expression, a static interface name evaluates to an
interface value.</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><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface%29%29" class="RktStxLink" data-pltdoc="x">define-interface</a></span><span class="hspace"> </span><span class="RktSym">stack<%></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty?</span><span class="hspace"> </span><span class="RktSym">push</span><span class="hspace"> </span><span class="RktSym">pop</span><span class="RktPn">)</span><span class="RktPn">)</span></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">stack<%></span></td></tr><tr><td><p><span class="RktRes">#<interface:stack<%>></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="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">stack%</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=createclass.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._class%252A%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">class*</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=createclass.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._object%7E25%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">object%</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">stack<%></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="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">items</span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">null</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="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=createclass.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._define%252Fpublic%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty?</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._null%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">null?</a></span><span class="hspace"> </span><span class="RktSym">items</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="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=createclass.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._define%252Fpublic%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">push</span><span class="hspace"> </span><span class="RktSym">x</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=set_.html%23%2528form._%2528%2528quote._%7E23%7E25kernel%2529._set%2521%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">set!</a></span><span class="hspace"> </span><span class="RktSym">items</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._cons%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">cons</a></span><span class="hspace"> </span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktSym">items</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="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=createclass.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._define%252Fpublic%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">define/public</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">pop</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=begin.html%23%2528form._%2528%2528quote._%7E23%7E25kernel%2529._begin%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">begin</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._car%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">car</a></span><span class="hspace"> </span><span class="RktSym">items</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=set_.html%23%2528form._%2528%2528quote._%7E23%7E25kernel%2529._set%2521%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">set!</a></span><span class="hspace"> </span><span class="RktSym">items</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._cdr%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">cdr</a></span><span class="hspace"> </span><span class="RktSym">items</span><span class="RktPn">)</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="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=objcreation.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._super-new%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">super-new</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></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"><span class="RktPn">(</span><a name="(form._((lib._unstable/class-iop..rkt)._define-interface/dynamic))"></a><span title="Provided from: unstable/class-iop | Package: unstable-list-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface%2Fdynamic%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define-interface/dynamic</a></span></span><span class="hspace"> </span><span class="RktVar">name-id</span><span class="hspace"> </span><span class="RktVar">ifc-expr</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">method-id</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Defines <span class="RktVar">name-id</span> as a static interface with dynamic
counterpart <span class="RktVar">ifc-expr</span>, which must evaluate to an interface
value. The static interface contains the methods named by the
<span class="RktVar">method-id</span>s. A run-time error is raised if any
<span class="RktVar">method-id</span> is not a member of the dynamic interface
<span class="RktVar">ifc-expr</span>.</div></p><p>Use <span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface%2Fdynamic%29%29" class="RktStxLink" data-pltdoc="x">define-interface/dynamic</a></span> to wrap interfaces from other
sources.</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><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface%2Fdynamic%29%29" class="RktStxLink" data-pltdoc="x">define-interface/dynamic</a></span><span class="hspace"> </span><span class="RktSym">object<%></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=objectutils.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._class-%7E3einterface%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">class->interface</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=createclass.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._object%7E25%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">object%</a></span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span><span class="RktPn">)</span></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">object<%></span></td></tr><tr><td><p><span class="RktRes">#<interface:object%></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._unstable/class-iop..rkt)._send/i))"></a><span title="Provided from: unstable/class-iop | Package: unstable-list-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fi%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">send/i</a></span></span><span class="hspace"> </span><span class="RktVar">obj-exp</span><span class="hspace"> </span><span class="RktVar">static-ifc-id</span><span class="hspace"> </span><span class="RktVar">method-id</span><span class="hspace"> </span><span class="RktVar">arg-expr</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Checked variant of <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=ivaraccess.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._send%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">send</a></span>.</div></p><p>The argument <span class="RktVar">static-ifc-id</span> must be defined as a static
interface. The method <span class="RktVar">method-id</span> must be a member of the
static interface <span class="RktVar">static-ifc-id</span>; otherwise a compile-time
error is raised.</p><p>The value of <span class="RktSym">obj-expr</span> must be an instance of the interface
<span class="RktVar">static-ifc-id</span>; otherwise, a run-time error is raised.</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><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">s</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=objcreation.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._new%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym">stack%</span><span class="RktPn">)</span><span class="RktPn">)</span></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="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fi%29%29" class="RktStxLink" data-pltdoc="x">send/i</a></span><span class="hspace"> </span><span class="RktSym">s</span><span class="hspace"> </span><span class="RktSym">stack<%></span><span class="hspace"> </span><span class="RktSym">push</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></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="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fi%29%29" class="RktStxLink" data-pltdoc="x">send/i</a></span><span class="hspace"> </span><span class="RktSym">s</span><span class="hspace"> </span><span class="RktSym">stack<%></span><span class="hspace"> </span><span class="RktSym">popp</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktErr">eval:9:0: send/i: method not in static interface</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace"> </span><span class="RktErr">in: popp</span></p></td></tr><tr><td><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fi%29%29" class="RktStxLink" data-pltdoc="x">send/i</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=objcreation.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._new%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">new</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=createclass.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._object%7E25%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">object%</a></span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">stack<%></span><span class="hspace"> </span><span class="RktSym">push</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktErr">send/i: interface check failed on: (object)</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._unstable/class-iop..rkt)._send*/i))"></a><span title="Provided from: unstable/class-iop | Package: unstable-list-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2A%2Fi%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">send*/i</a></span></span><span class="hspace"> </span><span class="RktVar">obj-expr</span><span class="hspace"> </span><span class="RktVar">static-ifc-id</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">method-id</span><span class="hspace"> </span><span class="RktVar">arg-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></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Checked variant of <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=ivaraccess.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._send%252A%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">send*</a></span>.</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="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2A%2Fi%29%29" class="RktStxLink" data-pltdoc="x">send*/i</a></span><span class="hspace"> </span><span class="RktSym">s</span><span class="hspace"> </span><span class="RktSym">stack<%></span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">push</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">pop</span><span class="RktPn">)</span><span class="RktPn">)</span></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"><span class="RktPn">(</span><a name="(form._((lib._unstable/class-iop..rkt)._send/apply/i))"></a><span title="Provided from: unstable/class-iop | Package: unstable-list-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fapply%2Fi%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">send/apply/i</a></span></span><span class="hspace"> </span><span class="RktVar">obj-expr</span><span class="hspace"> </span><span class="RktVar">static-ifc-id</span><span class="hspace"> </span><span class="RktVar">method-id</span><span class="hspace"> </span><span class="RktVar">arg-expr</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="hspace"> </span><span class="RktVar">list-arg-expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Checked variant of <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=ivaraccess.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._send%252Fapply%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">send/apply</a></span>.</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><span class="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fapply%2Fi%29%29" class="RktStxLink" data-pltdoc="x">send/apply/i</a></span><span class="hspace"> </span><span class="RktSym">s</span><span class="hspace"> </span><span class="RktSym">stack<%></span><span class="hspace"> </span><span class="RktSym">push</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</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></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._unstable/class-iop..rkt)._define/i))"></a><span title="Provided from: unstable/class-iop | Package: unstable-list-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define%2Fi%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define/i</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">static-ifc-id</span><span class="hspace"> </span><span class="RktVar">expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Checks that <span class="RktVar">expr</span> evaluates to an instance of
<span class="RktVar">static-ifc-id</span> before binding it to <span class="RktVar">id</span>. If
<span class="RktVar">id</span> is subsequently changed (with <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=set_.html%23%2528form._%2528%2528quote._%7E23%7E25kernel%2529._set%2521%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">set!</a></span>), the check is
performed again.</div></p><p>No dynamic object check is performed when calling a method (using
<span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fi%29%29" class="RktStxLink" data-pltdoc="x">send/i</a></span>, etc) on a name defined via <span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define%2Fi%29%29" class="RktStxLink" data-pltdoc="x">define/i</a></span>.</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><table cellspacing="0" cellpadding="0" class="together"><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._unstable/class-iop..rkt)._init/i))"></a><span title="Provided from: unstable/class-iop | Package: unstable-list-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._init%2Fi%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">init/i</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">static-ifc-id</span><span class="hspace"> </span><span class="RktVar">maybe-default-expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><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._unstable/class-iop..rkt)._init-field/i))"></a><span title="Provided from: unstable/class-iop | Package: unstable-list-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._init-field%2Fi%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">init-field/i</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">static-ifc-id</span><span class="hspace"> </span><span class="RktVar">maybe-default-expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><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._unstable/class-iop..rkt)._init-private/i))"></a><span title="Provided from: unstable/class-iop | Package: unstable-list-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._init-private%2Fi%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">init-private/i</a></span></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">static-ifc-id</span><span class="hspace"> </span><span class="RktVar">maybe-default-expr</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></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">maybe-default-expr</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="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">default-expr</span></td></tr></table></td></tr></table></td></tr></table></blockquote></div><div class="SIntrapara">Checked versions of <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=createclass.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._init%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">init</a></span> and <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=createclass.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._init-field%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">init-field</a></span>. The value
attached to each <span class="RktVar">id</span> is checked against the given interface.</div></p><p>No dynamic object check is performed when calling a method (using
<span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._send%2Fi%29%29" class="RktStxLink" data-pltdoc="x">send/i</a></span>, etc) on a name bound via one of these forms. Note
that in the case of <span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._init-field%2Fi%29%29" class="RktStxLink" data-pltdoc="x">init-field/i</a></span> this check omission is
unsound in the presence of mutation from outside the class. This
should be fixed.</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._unstable/class-iop..rkt)._define-interface-expander))"></a><span title="Provided from: unstable/class-iop | Package: unstable-list-lib"><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface-expander%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">define-interface-expander</a></span></span><span class="hspace"> </span><span class="RktVar">id</span><span class="hspace"> </span><span class="RktVar">transformer-expr</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Defines <span class="RktVar">id</span> as a macro that can be used within
<span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface%29%29" class="RktStxLink" data-pltdoc="x">define-interface</a></span> forms.</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="stt">> </span><span class="RktPn">(</span><span class="RktSym"><a href="#%28form._%28%28lib._unstable%2Fclass-iop..rkt%29._define-interface-expander%29%29" class="RktStxLink" data-pltdoc="x">define-interface-expander</a></span><span class="hspace"> </span><span class="RktSym">stack-methods</span></td></tr><tr><td><span class="hspace"> </span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=lambda.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._lambda%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">lambda</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">stx</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktRdr">#'</span><span class="RktPn">[</span><span class="RktSym">empty?</span><span class="hspace"> </span><span class="RktSym">push</span><span class="hspace"> </span><span class="RktSym">pop</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span></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._unstable%2Fclass-iop..rkt%29._define-interface%29%29" class="RktStxLink" data-pltdoc="x">define-interface</a></span><span class="hspace"> </span><span class="RktSym">stack<%></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="RktPn">(</span><span class="RktSym">stack-methods</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></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="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=objectutils.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fclass-internal..rkt%2529._interface-%7E3emethod-names%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">interface->method-names</a></span><span class="hspace"> </span><span class="RktSym">stack<%></span><span class="RktPn">)</span></td></tr><tr><td><p><span class="RktRes">'(empty? pop push)</span></p></td></tr></table></blockquote></td></tr></table></p><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="Hash_Tables.html" title="backward to "11 Hash Tables"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Unstable: May Change Without Warning"" data-pltdoc="x">up</a> <a href="lazy-require.html" title="forward to "13 Lazy Require"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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