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<?xml version="1.0" encoding="utf-8" ?>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>The MPL Reference Manual: sizeof_</title>
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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./metafunctions.html" class="navigation-link">Metafunctions</a> / <a href="./miscellaneous.html" class="navigation-link">Miscellaneous</a> / <a href="./sizeof.html" class="navigation-link">sizeof_</a></td>
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<div class="section" id="sizeof">
<h1><a class="toc-backref" href="./miscellaneous.html#id495" name="sizeof">sizeof_</a></h1>
<div class="section" id="sizeof-synopsis">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
typename X
&gt;
struct <a href="./sizeof.html" class="identifier">sizeof_</a>
{
typedef <em>unspecified</em> type;
};
</pre>
</div>
<div class="section" id="sizeof-description">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Returns the result of a <tt class="literal"><span class="pre">sizeof(X)</span></tt> expression wrapped into an
<a class="reference" href="./integral-constant.html">Integral Constant</a> of the corresponding type, <tt class="literal"><span class="pre">std::<a href="./size-t.html" class="identifier">size_t</a></span></tt>.</p>
</div>
<div class="section" id="sizeof-header">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/sizeof.hpp" class="header">boost/mpl/sizeof.hpp</a>&gt;
</pre>
</div>
<div class="section" id="sizeof-model-of">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<p><a class="reference" href="./metafunction.html">Metafunction</a></p>
</div>
<div class="section" id="sizeof-parameters">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
<table border="1" class="table">
<colgroup>
<col width="19%" />
<col width="25%" />
<col width="56%" />
</colgroup>
<thead valign="bottom">
<tr><th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre">X</span></tt></td>
<td>Any type</td>
<td>A type to compute the <tt class="literal"><span class="pre">sizeof</span></tt> for.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="sizeof-expression-semantics">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For an arbitrary type <tt class="literal"><span class="pre">x</span></tt>:</p>
<pre class="literal-block">
typedef <a href="./sizeof.html" class="identifier">sizeof_</a>&lt;x&gt;::type n;
</pre>
<table class="field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference" href="./integral-constant.html">Integral Constant</a>.</td>
</tr>
<tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><tt class="literal"><span class="pre">x</span></tt> is a complete type.</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="last literal-block">
typedef <a href="./size-t.html" class="identifier">size_t</a>&lt; sizeof(x) &gt; n;
</pre>
</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="sizeof-complexity">
<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
<p>Constant time.</p>
</div>
<div class="section" id="sizeof-example">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
struct udt { char a[100]; };
<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a>&lt;char&gt;::value, ==, sizeof(char) );
<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a>&lt;int&gt;::value, ==, sizeof(int) );
<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a>&lt;double&gt;::value, ==, sizeof(double) );
<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a>&lt;udt&gt;::value, ==, sizeof(my) );
</pre>
</div>
<div class="section" id="sizeof-see-also">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference" href="./metafunctions.html">Metafunctions</a>, <a class="reference" href="./integral-constant.html">Integral Constant</a>, <a class="refentry reference" href="./size-t.html"><tt class="refentry literal"><span class="pre">size_t</span></tt></a></p>
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