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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>16 Structures</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="../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="../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">Inside:<span class="mywbr"> </span> Racket C API</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="overview.html" class="tocviewlink" data-pltdoc="x">Overview</a></td></tr><tr><td align="right">2 </td><td><a href="embedding.html" class="tocviewlink" data-pltdoc="x">Embedding into a Program</a></td></tr><tr><td align="right">3 </td><td><a href="Writing_Racket_Extensions.html" class="tocviewlink" data-pltdoc="x">Writing Racket Extensions</a></td></tr><tr><td align="right">4 </td><td><a href="im_values_types.html" class="tocviewlink" data-pltdoc="x">Values and Types</a></td></tr><tr><td align="right">5 </td><td><a href="im_memoryalloc.html" class="tocviewlink" data-pltdoc="x">Memory Allocation</a></td></tr><tr><td align="right">6 </td><td><a href="im_env.html" class="tocviewlink" data-pltdoc="x">Namespaces and Modules</a></td></tr><tr><td align="right">7 </td><td><a href="Procedures.html" class="tocviewlink" data-pltdoc="x">Procedures</a></td></tr><tr><td align="right">8 </td><td><a href="Evaluation.html" class="tocviewlink" data-pltdoc="x">Evaluation</a></td></tr><tr><td align="right">9 </td><td><a href="exceptions.html" class="tocviewlink" data-pltdoc="x">Exceptions and Escape Continuations</a></td></tr><tr><td align="right">10 </td><td><a href="threads.html" class="tocviewlink" data-pltdoc="x">Threads</a></td></tr><tr><td align="right">11 </td><td><a href="config.html" class="tocviewlink" data-pltdoc="x">Parameterizations</a></td></tr><tr><td align="right">12 </td><td><a href="contmarks.html" class="tocviewlink" data-pltdoc="x">Continuation Marks</a></td></tr><tr><td align="right">13 </td><td><a href="im_encodings.html" class="tocviewlink" data-pltdoc="x">String Encodings</a></td></tr><tr><td align="right">14 </td><td><a href="Bignums__Rationals__and_Complex_Numbers.html" class="tocviewlink" data-pltdoc="x">Bignums, Rationals, and Complex Numbers</a></td></tr><tr><td align="right">15 </td><td><a href="Ports_and_the_Filesystem.html" class="tocviewlink" data-pltdoc="x">Ports and the Filesystem</a></td></tr><tr><td align="right">16 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Structures</a></td></tr><tr><td align="right">17 </td><td><a href="security.html" class="tocviewlink" data-pltdoc="x">Security Guards</a></td></tr><tr><td align="right">18 </td><td><a href="Custodians.html" class="tocviewlink" data-pltdoc="x">Custodians</a></td></tr><tr><td align="right">19 </td><td><a href="Subprocesses.html" class="tocviewlink" data-pltdoc="x">Subprocesses</a></td></tr><tr><td align="right">20 </td><td><a href="Miscellaneous_Utilities.html" class="tocviewlink" data-pltdoc="x">Miscellaneous Utilities</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></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="Ports_and_the_Filesystem.html" title="backward to "15 Ports and the Filesystem"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Inside: Racket C API"" data-pltdoc="x">up</a> <a href="security.html" title="forward to "17 Security Guards"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "scribblings/inside/inside.scrbl")" x-part-tag=""Structures"">16<tt> </tt><a name="(part._.Structures)"></a>Structures</h3><p>A new Racket structure type is created with
<a href="#%28cpp._scheme_make_struct_type%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_type</span></a>. This creates the structure type, but
does not generate the constructor, etc. procedures. The
<a href="#%28cpp._scheme_make_struct_values%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_values</span></a> function takes a structure type and
creates these procedures. The <a href="#%28cpp._scheme_make_struct_names%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_names</span></a> function
generates the standard structure procedures names given the structure
type’s name. Instances of a structure type are created with
<a href="#%28cpp._scheme_make_struct_instance%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_instance</span></a> and the function
<a href="#%28cpp._scheme_is_struct_instance%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_is_struct_instance</span></a> tests a structure’s type. The
<a href="#%28cpp._scheme_struct_ref%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_struct_ref</span></a> and <a href="#%28cpp._scheme_struct_set%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_struct_set</span></a> functions access
or modify a field of a structure.</p><p>The structure procedure values and names generated by
<a href="#%28cpp._scheme_make_struct_values%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_values</span></a> and <a href="#%28cpp._scheme_make_struct_names%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_names</span></a> can
be restricted by passing any combination of these flags:</p><ul><li><p><span class="stt">SCHEME_STRUCT_NO_TYPE</span> —<wbr></wbr> the structure type
value/name is not returned.</p></li><li><p><span class="stt">SCHEME_STRUCT_NO_CONSTR</span> —<wbr></wbr> the constructor procedure
value/name is not returned.</p></li><li><p><span class="stt">SCHEME_STRUCT_NO_PRED</span>—<wbr></wbr> the predicate procedure
value/name is not returned.</p></li><li><p><span class="stt">SCHEME_STRUCT_NO_GET</span> —<wbr></wbr> the selector procedure
values/names are not returned.</p></li><li><p><span class="stt">SCHEME_STRUCT_NO_SET</span> —<wbr></wbr> the mutator procedure
values/names are not returned.</p></li><li><p><span class="stt">SCHEME_STRUCT_GEN_GET</span> —<wbr></wbr> the field-independent
selector procedure value/name is returned.</p></li><li><p><span class="stt">SCHEME_STRUCT_GEN_SET</span> —<wbr></wbr> the field-independent
mutator procedure value/name is returned.</p></li><li><p><span class="stt">SCHEME_STRUCT_NO_MAKE_PREFIX</span> —<wbr></wbr> the constructor name
omits a <span class="RktSym">make-</span> prefix, like <span class="RktSym">struct</span> instead of
<span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=define-struct.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define-struct%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">define-struct</a></span>.</p></li></ul><p>When all values or names are returned, they are returned as an array
with the following order: structure type, constructor, predicate,
first selector, first mutator, second selector, etc.,
field-independent select, field-independent mutator. When particular
values/names are omitted, the array is compressed accordingly.</p><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="boxed"><tr><td><table cellspacing="0" cellpadding="0"><tr><td><p><span class="stt">Scheme_Object*</span></p></td><td><p><span class="hspace"> </span></p></td><td><p><a name="(cpp._scheme_make_struct_type)"></a><a name="(idx._(gentag._543._(lib._scribblings/inside/inside..scrbl)))"></a><a href="#%28cpp._scheme_make_struct_type%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_type</span></a></p></td><td><p><span class="stt">(</span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">base_name</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">super_type</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">inspector</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">int</span><span class="hspace"> </span><span style="font-style: italic">num_init_fields</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">int</span><span class="hspace"> </span><span style="font-style: italic">num_auto_fields</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">auto_val</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">properties</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">guard</span><span class="stt">)</span></p></td></tr></table></td></tr></table></div><div class="SIntrapara">Creates and returns a new structure type. The <span style="font-style: italic">base_name</span>
argument is used as the name of the new structure type; it must be a
symbol. The <span style="font-style: italic">super_type</span> argument should be <span class="stt">NULL</span> or an
existing structure type to use as the super-type. The <span style="font-style: italic">inspector</span>
argument should be <span class="stt">NULL</span> or an inspector to manage the type.
The <span style="font-style: italic">num_init_fields</span> argument specifies the number of fields
for instances of this structure type that have corresponding
constructor arguments. (If a super-type is used, this is the number
of additional fields, rather than the total number.) The
<span style="font-style: italic">num_auto_fields</span> argument specifies the number of additional
fields that have no corresponding constructor arguments, and they are
initialized to <span style="font-style: italic">auto_val</span>. The <span style="font-style: italic">properties</span> argument is a
list of property-value pairs. The <span style="font-style: italic">guard</span> argument is either NULL
or a procedure to use as a constructor guard.</div></p><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="boxed"><tr><td><table cellspacing="0" cellpadding="0"><tr><td colspan="3"><p><span class="stt">Scheme_Object**</span></p></td></tr><tr><td><p><a name="(cpp._scheme_make_struct_names)"></a><a name="(idx._(gentag._544._(lib._scribblings/inside/inside..scrbl)))"></a><a href="#%28cpp._scheme_make_struct_names%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_names</span></a></p></td><td><p><span class="stt">(</span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">base_name</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">field_names</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">int</span><span class="hspace"> </span><span style="font-style: italic">flags</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">int*</span><span class="hspace"> </span><span style="font-style: italic">count_out</span><span class="stt">)</span></p></td></tr></table></td></tr></table></div><div class="SIntrapara">Creates and returns an array of standard structure value name
symbols. The <span style="font-style: italic">base_name</span> argument is used as the name of the
structure type; it should be the same symbol passed to the associated
call to <a href="#%28cpp._scheme_make_struct_type%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_type</span></a>. The <span style="font-style: italic">field_names</span> argument
is a (Racket) list of field name symbols. The <span style="font-style: italic">flags</span> argument
specifies which names should be generated, and if <span style="font-style: italic">count_out</span> is
not <span class="stt">NULL</span>, <span style="font-style: italic">count_out</span> is filled with the number of names
returned in the array.</div></p><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="boxed"><tr><td><table cellspacing="0" cellpadding="0"><tr><td colspan="3"><p><span class="stt">Scheme_Object**</span></p></td></tr><tr><td><p><a name="(cpp._scheme_make_struct_values)"></a><a name="(idx._(gentag._545._(lib._scribblings/inside/inside..scrbl)))"></a><a href="#%28cpp._scheme_make_struct_values%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_values</span></a></p></td><td><p><span class="stt">(</span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">struct_type</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">Scheme_Object**</span><span class="hspace"> </span><span style="font-style: italic">names</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">int</span><span class="hspace"> </span><span style="font-style: italic">count</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">int</span><span class="hspace"> </span><span style="font-style: italic">flags</span><span class="stt">)</span></p></td></tr></table></td></tr></table></div><div class="SIntrapara">Creates and returns an array of the standard structure value and procedure values
for <span style="font-style: italic">struct_type</span>. The <span style="font-style: italic">struct_type</span> argument must be a structure type
value created by <a href="#%28cpp._scheme_make_struct_type%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_type</span></a>. The <span style="font-style: italic">names</span> procedure
must be an array of name symbols, generally the array returned by
<a href="#%28cpp._scheme_make_struct_names%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_names</span></a>. The <span style="font-style: italic">count</span> argument specifies the
length of the <span style="font-style: italic">names</span> array (and therefore the number of expected
return values) and the <span style="font-style: italic">flags</span> argument specifies which values
should be generated.</div></p><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="boxed"><tr><td><table cellspacing="0" cellpadding="0"><tr><td colspan="3"><p><span class="stt">Scheme_Object*</span></p></td></tr><tr><td><p><a name="(cpp._scheme_make_struct_instance)"></a><a name="(idx._(gentag._546._(lib._scribblings/inside/inside..scrbl)))"></a><a href="#%28cpp._scheme_make_struct_instance%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_make_struct_instance</span></a></p></td><td><p><span class="stt">(</span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">struct_type</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">int</span><span class="hspace"> </span><span style="font-style: italic">argc</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">Scheme_Object**</span><span class="hspace"> </span><span style="font-style: italic">argv</span><span class="stt">)</span></p></td></tr></table></td></tr></table></div><div class="SIntrapara">Creates an instance of the structure type <span style="font-style: italic">struct_type</span>. The
<span style="font-style: italic">argc</span> and <span style="font-style: italic">argv</span> arguments provide the field values for the
new instance.</div></p><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="boxed"><tr><td><table cellspacing="0" cellpadding="0"><tr><td><p><span class="stt">int</span></p></td><td><p><span class="hspace"> </span></p></td><td><p><a name="(cpp._scheme_is_struct_instance)"></a><a name="(idx._(gentag._547._(lib._scribblings/inside/inside..scrbl)))"></a><a href="#%28cpp._scheme_is_struct_instance%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_is_struct_instance</span></a></p></td><td><p><span class="stt">(</span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">struct_type</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">v</span><span class="stt">)</span></p></td></tr></table></td></tr></table></div><div class="SIntrapara">Returns 1 if <span style="font-style: italic">v</span> is an instance of <span style="font-style: italic">struct_type</span> or 0 otherwise.</div></p><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="boxed"><tr><td><table cellspacing="0" cellpadding="0"><tr><td><p><span class="stt">Scheme_Object*</span></p></td><td><p><span class="hspace"> </span></p></td><td><p><a name="(cpp._scheme_struct_ref)"></a><a name="(idx._(gentag._548._(lib._scribblings/inside/inside..scrbl)))"></a><a href="#%28cpp._scheme_struct_ref%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_struct_ref</span></a></p></td><td><p><span class="stt">(</span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">s</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">int</span><span class="hspace"> </span><span style="font-style: italic">n</span><span class="stt">)</span></p></td></tr></table></td></tr></table></div><div class="SIntrapara">Returns the <span style="font-style: italic">n</span>th field (counting from 0) in the structure <span style="font-style: italic">s</span>.</div></p><p><div class="SIntrapara"><table cellspacing="0" cellpadding="0" class="boxed"><tr><td><table cellspacing="0" cellpadding="0"><tr><td><p><span class="stt">void</span></p></td><td><p><span class="hspace"> </span></p></td><td><p><a name="(cpp._scheme_struct_set)"></a><a name="(idx._(gentag._549._(lib._scribblings/inside/inside..scrbl)))"></a><a href="#%28cpp._scheme_struct_set%29" class="RktStxLink" data-pltdoc="x"><span class="stt">scheme_struct_set</span></a></p></td><td><p><span class="stt">(</span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">s</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">int</span><span class="hspace"> </span><span style="font-style: italic">n</span><span class="stt">,</span></p></td></tr><tr><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="hspace"> </span></p></td><td><p><span class="stt">Scheme_Object*</span><span class="hspace"> </span><span style="font-style: italic">v</span><span class="stt">)</span></p></td></tr></table></td></tr></table></div><div class="SIntrapara">Sets the <span style="font-style: italic">n</span>th field (counting from 0) in the structure <span style="font-style: italic">s</span> to <span style="font-style: italic">v</span>.</div></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"; 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