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- <div class="section" id="sizeof">
- <h1><a class="toc-backref" href="./miscellaneous.html#id1571">sizeof_</a></h1>
- <div class="section" id="id1207">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename X
- >
- struct <a href="./sizeof.html" class="identifier">sizeof_</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id1208">
- <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 internal" 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="id1209">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/sizeof.hpp" class="header">boost/mpl/sizeof.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id1210">
- <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
- <p><a class="reference internal" href="./metafunction.html">Metafunction</a></p>
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- <div class="section" id="id1211">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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- <tr><th class="head">Parameter</th>
- <th class="head">Requirement</th>
- <th class="head">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="id1212">
- <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><x>::type n;
- </pre>
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- <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"><p class="first"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">x</span></tt> is a complete type.</p>
- </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>< sizeof(x) > n;
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id1213">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Constant time.</p>
- </div>
- <div class="section" id="id1214">
- <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><char>::value, ==, sizeof(char) );
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a><int>::value, ==, sizeof(int) );
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a><double>::value, ==, sizeof(double) );
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a><udt>::value, ==, sizeof(my) );
- </pre>
- </div>
- <div class="section" id="id1215">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./metafunctions.html">Metafunctions</a>, <a class="reference internal" href="./integral-constant.html">Integral Constant</a>, <a class="reference internal" href="./size-t.html">size_t</a></p>
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