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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"> | |
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| 6 | <meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> | |
| 7 | <title>The MPL Reference Manual: Integral Constant</title> | |
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| 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="./data-types-concepts.html" class="navigation-link">Prev</a> <a href="./numeric.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./data-types-concepts.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="./data-types.html" class="navigation-link">Data Types</a> / <a href="./data-types-concepts.html" class="navigation-link">Concepts</a> / <a href="./integral-constant.html" class="navigation-link">Integral Constant</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="integral-constant"> | |
| 15 | <h1><a class="toc-backref" href="./data-types-concepts.html#id1574">Integral Constant</a></h1> | |
| 16 | <div class="section" id="id1217"> | |
| 17 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 18 | <p>An <a class="reference internal" href="./integral-constant.html">Integral Constant</a> is a holder class for a compile-time value of an | |
| 19 | integral type. Every <a class="reference internal" href="./integral-constant.html">Integral Constant</a> is also a nullary <a class="reference internal" href="./metafunction.html">Metafunction</a>, | |
| 20 | returning itself. An integral constant <em>object</em> is implicitly convertible to the | |
| 21 | corresponding run-time value of the wrapped integral type.</p> | |
| 22 | </div> | |
| 23 | <div class="section" id="id1218"> | |
| 24 | <h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3> | |
| 25 | <p>In the following table and subsequent specifications, <tt class="literal"><span class="pre">n</span></tt> is a model of <a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p> | |
| 26 | <table border="1" class="docutils table"> | |
| 27 | <colgroup> | |
| 28 | <col width="35%" /> | |
| 29 | <col width="39%" /> | |
| 30 | <col width="27%" /> | |
| 31 | </colgroup> | |
| 32 | <thead valign="bottom"> | |
| 33 | <tr><th class="head">Expression</th> | |
| 34 | <th class="head">Type</th> | |
| 35 | <th class="head">Complexity</th> | |
| 36 | </tr> | |
| 37 | </thead> | |
| 38 | <tbody valign="top"> | |
| 39 | <tr><td><tt class="literal"><span class="pre">n::tag</span></tt></td> | |
| 40 | <td><tt class="literal"><span class="pre">integral_c_tag</span></tt></td> | |
| 41 | <td>Constant time.</td> | |
| 42 | </tr> | |
| 43 | <tr><td><tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span></tt></td> | |
| 44 | <td>An integral type</td> | |
| 45 | <td>Constant time.</td> | |
| 46 | </tr> | |
| 47 | <tr><td><tt class="literal"><span class="pre">n::value</span></tt></td> | |
| 48 | <td>An integral constant expression</td> | |
| 49 | <td>Constant time.</td> | |
| 50 | </tr> | |
| 51 | <tr><td><tt class="literal"><span class="pre">n::type</span></tt></td> | |
| 52 | <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> | |
| 53 | <td>Constant time.</td> | |
| 54 | </tr> | |
| 55 | <tr><td><tt class="literal"><span class="pre"><a href="./next.html" class="identifier">next</a><n>::type</span></tt></td> | |
| 56 | <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> | |
| 57 | <td>Constant time.</td> | |
| 58 | </tr> | |
| 59 | <tr><td><tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a><n>::type</span></tt></td> | |
| 60 | <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> | |
| 61 | <td>Constant time.</td> | |
| 62 | </tr> | |
| 63 | <tr><td><tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span> <span class="pre">const</span> <span class="pre">c</span> <span class="pre">=</span> <span class="pre">n()</span></tt></td> | |
| 64 | <td> </td> | |
| 65 | <td>Constant time.</td> | |
| 66 | </tr> | |
| 67 | </tbody> | |
| 68 | </table> | |
| 69 | </div> | |
| 70 | <div class="section" id="id1219"> | |
| 71 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 72 | <table border="1" class="docutils table"> | |
| 73 | <colgroup> | |
| 74 | <col width="40%" /> | |
| 75 | <col width="60%" /> | |
| 76 | </colgroup> | |
| 77 | <thead valign="bottom"> | |
| 78 | <tr><th class="head">Expression</th> | |
| 79 | <th class="head">Semantics</th> | |
| 80 | </tr> | |
| 81 | </thead> | |
| 82 | <tbody valign="top"> | |
| 83 | <tr><td><tt class="literal"><span class="pre">n::tag</span></tt></td> | |
| 84 | <td><tt class="literal"><span class="pre">n</span></tt>'s tag type; <tt class="literal"><span class="pre">n::tag::value</span></tt> is <tt class="literal"><span class="pre">n</span></tt>'s | |
| 85 | <em>conversion rank</em>.</td> | |
| 86 | </tr> | |
| 87 | <tr><td><tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span></tt></td> | |
| 88 | <td>A cv-unqualified type of <tt class="literal"><span class="pre">n::value</span></tt>.</td> | |
| 89 | </tr> | |
| 90 | <tr><td><tt class="literal"><span class="pre">n::value</span></tt></td> | |
| 91 | <td>The value of the wrapped integral constant.</td> | |
| 92 | </tr> | |
| 93 | <tr><td><tt class="literal"><span class="pre">n::type</span></tt></td> | |
| 94 | <td><tt class="literal"><span class="pre">is_same<n::type,n>::value</span> <span class="pre">==</span> <span class="pre">true</span></tt>.</td> | |
| 95 | </tr> | |
| 96 | <tr><td><tt class="literal"><span class="pre"><a href="./next.html" class="identifier">next</a><n>::type</span></tt></td> | |
| 97 | <td>An <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> of type <tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span></tt> | |
| 98 | such that <tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">n::value</span> <span class="pre">+</span> <span class="pre">1</span></tt>.</td> | |
| 99 | </tr> | |
| 100 | <tr><td><tt class="literal"><span class="pre"><a href="./prior.html" class="identifier">prior</a><n>::type</span></tt></td> | |
| 101 | <td>An <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> of type <tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span></tt> | |
| 102 | such that <tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">n::value</span> <span class="pre">-</span> <span class="pre">1</span></tt>.</td> | |
| 103 | </tr> | |
| 104 | <tr><td><tt class="literal"><span class="pre">n::<a href="./value-type.html" class="identifier">value_type</a></span> <span class="pre">const</span> <span class="pre">c</span> <span class="pre">=</span> <span class="pre">n()</span></tt></td> | |
| 105 | <td><tt class="literal"><span class="pre">c</span> <span class="pre">==</span> <span class="pre">n::value</span></tt>.</td> | |
| 106 | </tr> | |
| 107 | </tbody> | |
| 108 | </table> | |
| 109 | </div> | |
| 110 | <div class="section" id="id1220"> | |
| 111 | <h3><a class="subsection-title" href="#models" name="models">Models</a></h3> | |
| 112 | <ul class="simple"> | |
| 113 | <li><a class="reference internal" href="./bool.html">bool_</a></li> | |
| 114 | <li><a class="reference internal" href="./int.html">int_</a></li> | |
| 115 | <li><a class="reference internal" href="./long.html">long_</a></li> | |
| 116 | <li><a class="reference internal" href="./char.html">char_</a></li> | |
| 117 | <li><a class="reference internal" href="./integral-c.html">integral_c</a></li> | |
| 118 | </ul> | |
| 119 | </div> | |
| 120 | <div class="section" id="id1221"> | |
| 121 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 122 | <p><a class="reference internal" href="./data-types.html">Data Types</a>, <a class="reference internal" href="./integral-sequence-wrapper.html">Integral Sequence Wrapper</a>, <a class="reference internal" href="./integral-c.html">integral_c</a></p> | |
| 123 | </div> | |
| 124 | </div> | |
| 125 | ||
| 126 | <div class="footer-separator"></div> | |
| 127 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./data-types-concepts.html" class="navigation-link">Prev</a> <a href="./numeric.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./data-types-concepts.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> | |
| 128 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
| 129 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 130 | 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> | |
| 131 | </html> |