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: at_c</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="./at.html" class="navigation-link">Prev</a> <a href="./back.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./at.html" class="navigation-link">Back</a> <a href="./back.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="./at-c.html" class="navigation-link">at_c</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="at-c"> | |
| 15 | <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1426">at_c</a></h1> | |
| 16 | <div class="section" id="id185"> | |
| 17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
| 18 | <pre class="literal-block"> | |
| 19 | template< | |
| 20 | typename Sequence | |
| 21 | , long n | |
| 22 | > | |
| 23 | struct <a href="./at-c.html" class="identifier">at_c</a> | |
| 24 | { | |
| 25 | typedef <em>unspecified</em> type; | |
| 26 | }; | |
| 27 | </pre> | |
| 28 | </div> | |
| 29 | <div class="section" id="id186"> | |
| 30 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 31 | <p>Returns a type identical to the <tt class="literal"><span class="pre">n</span></tt>th element from the beginning of | |
| 32 | the sequence. <tt class="literal"><span class="pre"><a href="./at-c.html" class="identifier">at_c</a><Sequence,n>::type</span></tt> is a shorcut notation for | |
| 33 | <tt class="literal"><span class="pre"><a href="./at.html" class="identifier">at</a><</span> <span class="pre">Sequence,</span> <span class="pre"><a href="./long.html" class="identifier">long_</a><n></span> <span class="pre">>::type</span></tt>.</p> | |
| 34 | </div> | |
| 35 | <div class="section" id="id187"> | |
| 36 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 37 | <pre class="literal-block"> | |
| 38 | #include <<a href="../../../../boost/mpl/at.hpp" class="header">boost/mpl/at.hpp</a>> | |
| 39 | </pre> | |
| 40 | </div> | |
| 41 | <div class="section" id="id188"> | |
| 42 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
| 43 | <table border="1" class="docutils table"> | |
| 44 | <colgroup> | |
| 45 | <col width="15%" /> | |
| 46 | <col width="36%" /> | |
| 47 | <col width="48%" /> | |
| 48 | </colgroup> | |
| 49 | <thead valign="bottom"> | |
| 50 | <tr><th class="head">Parameter</th> | |
| 51 | <th class="head">Requirement</th> | |
| 52 | <th class="head">Description</th> | |
| 53 | </tr> | |
| 54 | </thead> | |
| 55 | <tbody valign="top"> | |
| 56 | <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> | |
| 57 | <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> | |
| 58 | <td>A sequence to be examined.</td> | |
| 59 | </tr> | |
| 60 | <tr><td><tt class="literal"><span class="pre">n</span></tt></td> | |
| 61 | <td>A compile-time integral constant</td> | |
| 62 | <td>An offset from the beginning of the sequence | |
| 63 | specifying the element to be retrieved.</td> | |
| 64 | </tr> | |
| 65 | </tbody> | |
| 66 | </table> | |
| 67 | </div> | |
| 68 | <div class="section" id="id189"> | |
| 69 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 70 | <pre class="literal-block"> | |
| 71 | typedef <a href="./at-c.html" class="identifier">at_c</a><Sequence,n>::type t; | |
| 72 | </pre> | |
| 73 | <table class="docutils field-list" frame="void" rules="none"> | |
| 74 | <col class="field-name" /> | |
| 75 | <col class="field-body" /> | |
| 76 | <tbody valign="top"> | |
| 77 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type</p> | |
| 78 | </td> | |
| 79 | </tr> | |
| 80 | <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">0</span> <span class="pre"><=</span> <span class="pre">n</span> <span class="pre"><</span> <span class="pre"><a href="./size.html" class="identifier">size</a><Sequence>::value</span></tt></p> | |
| 81 | </td> | |
| 82 | </tr> | |
| 83 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> | |
| 84 | <pre class="last literal-block"> | |
| 85 | typedef <a href="./at.html" class="identifier">at</a>< Sequence, <a href="./long.html" class="identifier">long_</a><n> >::type t; | |
| 86 | </pre> | |
| 87 | </td> | |
| 88 | </tr> | |
| 89 | </tbody> | |
| 90 | </table> | |
| 91 | </div> | |
| 92 | <div class="section" id="id190"> | |
| 93 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> | |
| 94 | <table border="1" class="docutils table"> | |
| 95 | <colgroup> | |
| 96 | <col width="47%" /> | |
| 97 | <col width="53%" /> | |
| 98 | </colgroup> | |
| 99 | <thead valign="bottom"> | |
| 100 | <tr><th class="head">Sequence archetype</th> | |
| 101 | <th class="head">Complexity</th> | |
| 102 | </tr> | |
| 103 | </thead> | |
| 104 | <tbody valign="top"> | |
| 105 | <tr><td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> | |
| 106 | <td>Linear.</td> | |
| 107 | </tr> | |
| 108 | <tr><td><a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a></td> | |
| 109 | <td>Amortized constant time.</td> | |
| 110 | </tr> | |
| 111 | </tbody> | |
| 112 | </table> | |
| 113 | </div> | |
| 114 | <div class="section" id="id191"> | |
| 115 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 116 | <pre class="literal-block"> | |
| 117 | typedef <a href="./range-c.html" class="identifier">range_c</a><long,10,50> range; | |
| 118 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( (<a href="./at-c.html" class="identifier">at_c</a>< range,0 >::type::value), ==, 10 ); | |
| 119 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( (<a href="./at-c.html" class="identifier">at_c</a>< range,10 >::type::value), ==, 20 ); | |
| 120 | <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( (<a href="./at-c.html" class="identifier">at_c</a>< range,40 >::type::value), ==, 50 ); | |
| 121 | </pre> | |
| 122 | </div> | |
| 123 | <div class="section" id="id192"> | |
| 124 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 125 | <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="./at.html">at</a>, <a class="reference internal" href="./front.html">front</a>, <a class="reference internal" href="./back.html">back</a></p> | |
| 126 | <!-- Sequences/Intrinsic Metafunctions//back --> | |
| 127 | </div> | |
| 128 | </div> | |
| 129 | ||
| 130 | <div class="footer-separator"></div> | |
| 131 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./at.html" class="navigation-link">Prev</a> <a href="./back.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./at.html" class="navigation-link">Back</a> <a href="./back.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> | |
| 132 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 133 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 134 | 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> | |
| 135 | </html> |