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| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: sizeof_</title> | |
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| 10 | <body class="docframe refmanual"> | |
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| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="sizeof"> | |
| 15 | <h1><a class="toc-backref" href="./miscellaneous.html#id1571">sizeof_</a></h1> | |
| 16 | <div class="section" id="id1207"> | |
| 17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
| 18 | <pre class="literal-block"> | |
| 19 | template< | |
| 20 | typename X | |
| 21 | > | |
| 22 | struct <a href="./sizeof.html" class="identifier">sizeof_</a> | |
| 23 | { | |
| 24 | typedef <em>unspecified</em> type; | |
| 25 | }; | |
| 26 | </pre> | |
| 27 | </div> | |
| 28 | <div class="section" id="id1208"> | |
| 29 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 30 | <p>Returns the result of a <tt class="literal"><span class="pre">sizeof(X)</span></tt> expression wrapped into an | |
| 31 | <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> | |
| 32 | </div> | |
| 33 | <div class="section" id="id1209"> | |
| 34 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 35 | <pre class="literal-block"> | |
| 36 | #include <<a href="../../../../boost/mpl/sizeof.hpp" class="header">boost/mpl/sizeof.hpp</a>> | |
| 37 | </pre> | |
| 38 | </div> | |
| 39 | <div class="section" id="id1210"> | |
| 40 | <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> | |
| 41 | <p><a class="reference internal" href="./metafunction.html">Metafunction</a></p> | |
| 42 | </div> | |
| 43 | <div class="section" id="id1211"> | |
| 44 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
| 45 | <table border="1" class="docutils table"> | |
| 46 | <colgroup> | |
| 47 | <col width="19%" /> | |
| 48 | <col width="25%" /> | |
| 49 | <col width="56%" /> | |
| 50 | </colgroup> | |
| 51 | <thead valign="bottom"> | |
| 52 | <tr><th class="head">Parameter</th> | |
| 53 | <th class="head">Requirement</th> | |
| 54 | <th class="head">Description</th> | |
| 55 | </tr> | |
| 56 | </thead> | |
| 57 | <tbody valign="top"> | |
| 58 | <tr><td><tt class="literal"><span class="pre">X</span></tt></td> | |
| 59 | <td>Any type</td> | |
| 60 | <td>A type to compute the <tt class="literal"><span class="pre">sizeof</span></tt> for.</td> | |
| 61 | </tr> | |
| 62 | </tbody> | |
| 63 | </table> | |
| 64 | </div> | |
| 65 | <div class="section" id="id1212"> | |
| 66 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 67 | <p>For an arbitrary type <tt class="literal"><span class="pre">x</span></tt>:</p> | |
| 68 | <pre class="literal-block"> | |
| 69 | typedef <a href="./sizeof.html" class="identifier">sizeof_</a><x>::type n; | |
| 70 | </pre> | |
| 71 | <table class="docutils field-list" frame="void" rules="none"> | |
| 72 | <col class="field-name" /> | |
| 73 | <col class="field-body" /> | |
| 74 | <tbody valign="top"> | |
| 75 | <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> | |
| 76 | </td> | |
| 77 | </tr> | |
| 78 | <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> | |
| 79 | </td> | |
| 80 | </tr> | |
| 81 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> | |
| 82 | <pre class="last literal-block"> | |
| 83 | typedef <a href="./size-t.html" class="identifier">size_t</a>< sizeof(x) > n; | |
| 84 | </pre> | |
| 85 | </td> | |
| 86 | </tr> | |
| 87 | </tbody> | |
| 88 | </table> | |
| 89 | </div> | |
| 90 | <div class="section" id="id1213"> | |
| 91 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> | |
| 92 | <p>Constant time.</p> | |
| 93 | </div> | |
| 94 | <div class="section" id="id1214"> | |
| 95 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 96 | <pre class="literal-block"> | |
| 97 | struct udt { char a[100]; }; | |
| 98 | ||
| 99 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a><char>::value, ==, sizeof(char) ); | |
| 100 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a><int>::value, ==, sizeof(int) ); | |
| 101 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a><double>::value, ==, sizeof(double) ); | |
| 102 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./sizeof.html" class="identifier">sizeof_</a><udt>::value, ==, sizeof(my) ); | |
| 103 | </pre> | |
| 104 | </div> | |
| 105 | <div class="section" id="id1215"> | |
| 106 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 107 | <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> | |
| 108 | </div> | |
| 109 | </div> | |
| 110 | ||
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| 113 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 114 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 115 | file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body> | |
| 116 | </html> |