projects / ceph.git / blame
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1 | <?xml version="1.0" encoding="utf-8" ?> |
| 2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | |
| 3 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> | |
| 4 | <head> | |
| 5 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> | |
| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: size</title> | |
| 8 | <link rel="stylesheet" href="../style.css" type="text/css" /> | |
| 9 | </head> | |
| 10 | <body class="docframe refmanual"> | |
| 11 | <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./sequence-tag.html" class="navigation-link">Prev</a> <a href="./value-type.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./sequence-tag.html" class="navigation-link">Back</a> <a href="./value-type.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./intrinsic-metafunctions.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
| 12 | <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./size.html" class="navigation-link">size</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="size"> | |
| 15 | <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1446">size</a></h1> | |
| 16 | <div class="section" id="id362"> | |
| 17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
| 18 | <pre class="literal-block"> | |
| 19 | template< | |
| 20 | typename Sequence | |
| 21 | > | |
| 22 | struct <a href="./size.html" class="identifier">size</a> | |
| 23 | { | |
| 24 | typedef <em>unspecified</em> type; | |
| 25 | }; | |
| 26 | </pre> | |
| 27 | </div> | |
| 28 | <div class="section" id="id363"> | |
| 29 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 30 | <p><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a></span></tt> returns the number of elements in the sequence, that is, the number of elements | |
| 31 | in the range [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Sequence>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Sequence>::type</span></tt>).</p> | |
| 32 | </div> | |
| 33 | <div class="section" id="id364"> | |
| 34 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 35 | <pre class="literal-block"> | |
| 36 | #include <<a href="../../../../boost/mpl/size.hpp" class="header">boost/mpl/size.hpp</a>> | |
| 37 | </pre> | |
| 38 | </div> | |
| 39 | <div class="section" id="id365"> | |
| 40 | <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> | |
| 41 | <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p> | |
| 42 | </div> | |
| 43 | <div class="section" id="id366"> | |
| 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="18%" /> | |
| 48 | <col width="27%" /> | |
| 49 | <col width="55%" /> | |
| 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">Sequence</span></tt></td> | |
| 59 | <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> | |
| 60 | <td>A sequence to query.</td> | |
| 61 | </tr> | |
| 62 | </tbody> | |
| 63 | </table> | |
| 64 | </div> | |
| 65 | <div class="section" id="id367"> | |
| 66 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 67 | <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>:</p> | |
| 68 | <pre class="literal-block"> | |
| 69 | typedef <a href="./size.html" class="identifier">size</a><s>::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">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> | |
| 79 | <pre class="literal-block"> | |
| 80 | typedef <a href="./distance.html" class="identifier">distance</a>< <a href="./begin.html" class="identifier">begin</a><s>::type,<a href="./end.html" class="identifier">end</a><s>::type >::type n; | |
| 81 | </pre> | |
| 82 | </td> | |
| 83 | </tr> | |
| 84 | <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first last"><tt class="literal"><span class="pre">n::value</span> <span class="pre">>=</span> <span class="pre">0</span></tt>.</p> | |
| 85 | </td> | |
| 86 | </tr> | |
| 87 | </tbody> | |
| 88 | </table> | |
| 89 | </div> | |
| 90 | <div class="section" id="id368"> | |
| 91 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> | |
| 92 | <p>The complexity of the <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a></span></tt> metafunction directly depends on the implementation of | |
| 93 | the particular sequence it is applied to. In the worst case, <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a></span></tt> guarantees a | |
| 94 | linear complexity.</p> | |
| 95 | <p>If the <tt class="literal"><span class="pre">s</span></tt> is a <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>, <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::type</span></tt> is an <em>O(1)</em> operation. | |
| 96 | The opposite is not necessarily true — for example, a sequence class that models | |
| 97 | <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> might still give us an <em>O(1)</em> <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a></span></tt> implementation.</p> | |
| 98 | </div> | |
| 99 | <div class="section" id="id369"> | |
| 100 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 101 | <pre class="literal-block"> | |
| 102 | typedef list0<> empty_list; | |
| 103 | typedef <a href="./vector-c.html" class="identifier">vector_c</a><int,0,1,2,3,4,5> numbers; | |
| 104 | typedef <a href="./range-c.html" class="identifier">range_c</a><int,0,100> more_numbers; | |
| 105 | ||
| 106 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><<a href="./list.html" class="identifier">list</a>>::value, ==, 0 ); | |
| 107 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><numbers>::value, ==, 5 ); | |
| 108 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><more_numbers>::value, ==, 100 ); | |
| 109 | </pre> | |
| 110 | </div> | |
| 111 | <div class="section" id="id370"> | |
| 112 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 113 | <p><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>, <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>, <a class="reference internal" href="./empty.html">empty</a>, <a class="reference internal" href="./begin.html">begin</a>, <a class="reference internal" href="./end.html">end</a>, <a class="reference internal" href="./distance.html">distance</a></p> | |
| 114 | <!-- Sequences/Intrinsic Metafunctions//value_type --> | |
| 115 | </div> | |
| 116 | </div> | |
| 117 | ||
| 118 | <div class="footer-separator"></div> | |
| 119 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./sequence-tag.html" class="navigation-link">Prev</a> <a href="./value-type.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./sequence-tag.html" class="navigation-link">Back</a> <a href="./value-type.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./intrinsic-metafunctions.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
| 120 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 121 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 122 | 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> | |
| 123 | </html> |