<?xml version="1.0" encoding="utf-8" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="generator" content="Docutils 0.6: http://docutils.sourceforge.net/" /> <title>The MPL Reference Manual: bool_</title> <link rel="stylesheet" href="../style.css" type="text/css" /> </head> <body class="docframe refmanual"> <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./numeric.html" class="navigation-link">Prev</a> <a href="./int.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./int.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./numeric.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> <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="./numeric.html" class="navigation-link">Numeric</a> / <a href="./bool.html" class="navigation-link">bool_</a></td> </tr></table><div class="header-separator"></div> <div class="section" id="bool"> <h1><a class="toc-backref" href="./numeric.html#id1559">bool_</a></h1> <div class="section" id="id1222"> <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> <pre class="literal-block"> template< bool C > struct <a href="./bool.html" class="identifier">bool_</a> { // <em>unspecified</em> // ... }; typedef <a href="./bool.html" class="identifier">bool_</a><true> <a href="./bool.html" class="identifier">true_</a>; typedef <a href="./bool.html" class="identifier">bool_</a><false> <a href="./bool.html" class="identifier">false_</a>; </pre> </div> <div class="section" id="id1223"> <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> <p>A boolean <a class="reference internal" href="./integral-constant.html">Integral Constant</a> wrapper.</p> </div> <div class="section" id="id1224"> <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> <pre class="literal-block"> #include <<a href="../../../../boost/mpl/bool.hpp" class="header">boost/mpl/bool.hpp</a>> </pre> </div> <div class="section" id="id1225"> <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> <p><a class="reference internal" href="./integral-constant.html">Integral Constant</a></p> </div> <div class="section" id="id1226"> <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> <table border="1" class="docutils table"> <colgroup> <col width="21%" /> <col width="42%" /> <col width="37%" /> </colgroup> <thead valign="bottom"> <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">C</span></tt></td> <td>A boolean integral constant</td> <td>A value to wrap.</td> </tr> </tbody> </table> </div> <div class="section" id="id1227"> <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> <p>The semantics of an expression are defined only where they differ from, or are not defined in <a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p> <p>For arbitrary integral constant <tt class="literal"><span class="pre">c</span></tt>:</p> <table border="1" class="docutils table"> <colgroup> <col width="24%" /> <col width="76%" /> </colgroup> <thead valign="bottom"> <tr><th class="head">Expression</th> <th class="head">Semantics</th> </tr> </thead> <tbody valign="top"> <tr><td><tt class="literal"><span class="pre"><a href="./bool.html" class="identifier">bool_</a><c></span></tt></td> <td>An <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">x</span></tt> such that <tt class="literal"><span class="pre">x::value</span> <span class="pre">==</span> <span class="pre">c</span></tt> and <tt class="literal"><span class="pre">x::<a href="./value-type.html" class="identifier">value_type</a></span></tt> is identical to <tt class="literal"><span class="pre">bool</span></tt>.</td> </tr> </tbody> </table> </div> <div class="section" id="id1228"> <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> <pre class="literal-block"> <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./bool.html" class="identifier">bool_</a><true>::<a href="./value-type.html" class="identifier">value_type</a>, bool > )); <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./bool.html" class="identifier">bool_</a><true>, <a href="./bool.html" class="identifier">true_</a> > )); } <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./bool.html" class="identifier">bool_</a><true>::type, <a href="./bool.html" class="identifier">bool_</a><true> > )); <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./bool.html" class="identifier">bool_</a><true>::value, ==, true ); assert( <a href="./bool.html" class="identifier">bool_</a><true>() == true ); </pre> </div> <div class="section" id="id1229"> <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> <p><a class="reference internal" href="./data-types.html">Data Types</a>, <a class="reference internal" href="./integral-constant.html">Integral Constant</a>, <a class="reference internal" href="./int.html">int_</a>, <a class="reference internal" href="./long.html">long_</a>, <a class="reference internal" href="./integral-c.html">integral_c</a></p> <!-- Data Types/Numeric//int_ |20 --> </div> </div> <div class="footer-separator"></div> <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./numeric.html" class="navigation-link">Prev</a> <a href="./int.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group">Back <a href="./int.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./numeric.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> <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> Distributed under the Boost Software License, Version 1.0. 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