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: less_equal</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="./less.html" class="navigation-link">Prev</a> <a href="./greater.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./less.html" class="navigation-link">Back</a> <a href="./greater.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./comparisons.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="./metafunctions.html" class="navigation-link">Metafunctions</a> / <a href="./comparisons.html" class="navigation-link">Comparisons</a> / <a href="./less-equal.html" class="navigation-link">less_equal</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="less-equal"> 15<h1><a class="toc-backref" href="./comparisons.html#id1544">less_equal</a></h1> 16<div class="section" id="id1023"> 17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> 18<pre class="literal-block"> 19template< 20 typename T1 21 , typename T2 22 > 23struct <a href="./less-equal.html" class="identifier">less_equal</a> 24{ 25 typedef <em>unspecified</em> type; 26}; 27</pre> 28</div> 29<div class="section" id="id1024"> 30<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 31<p>Returns a true-valued <a class="reference internal" href="./integral-constant.html">Integral Constant</a> if <tt class="literal"><span class="pre">T1</span></tt> is less than or equal to <tt class="literal"><span class="pre">T2</span></tt>.</p> 32</div> 33<div class="section" id="id1025"> 34<h3><a class="subsection-title" href="#header" name="header">Header</a></h3> 35<pre class="literal-block"> 36#include <<a href="../../../../boost/mpl/less_equal.hpp" class="header">boost/mpl/less_equal.hpp</a>> 37#include <<a href="../../../../boost/mpl/comparison.hpp" class="header">boost/mpl/comparison.hpp</a>> 38</pre> 39</div> 40<div class="section" id="id1026"> 41<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> 42<p><a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a></p> 43</div> 44<div class="section" id="id1027"> 45<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> 46<table border="1" class="docutils table"> 47<colgroup> 48<col width="17%" /> 49<col width="30%" /> 50<col width="53%" /> 51</colgroup> 52<thead valign="bottom"> 53<tr><th class="head">Parameter</th> 54<th class="head">Requirement</th> 55<th class="head">Description</th> 56</tr> 57</thead> 58<tbody valign="top"> 59<tr><td><tt class="literal"><span class="pre">T1</span></tt>, <tt class="literal"><span class="pre">T2</span></tt></td> 60<td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td> 61<td>Operation's arguments.</td> 62</tr> 63</tbody> 64</table> 65<p>[<em>Note:</em> The requirements listed in this specification 66are the ones imposed by the default implementation. See <a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a> concept 67for the details on how to provide an implementation for a user-defined numeric type 68that does not satisfy the <a class="reference internal" href="./integral-constant.html">Integral Constant</a> requirements. — <em>end note</em>]</p> 69</div> 70<div class="section" id="id1028"> 71<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 72<p>For any <a class="reference internal" href="./integral-constant.html">Integral Constant</a>s <tt class="literal"><span class="pre">c1</span></tt> and <tt class="literal"><span class="pre">c2</span></tt>:</p> 73<pre class="literal-block"> 74typedef <a href="./less-equal.html" class="identifier">less_equal</a><c1,c2>::type r; 75</pre> 76<table class="docutils field-list" frame="void" rules="none"> 77<col class="field-name" /> 78<col class="field-body" /> 79<tbody valign="top"> 80<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> 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"> 85typedef <a href="./bool.html" class="identifier">bool_</a>< (c1::value <= c2::value) > r; 86</pre> 87</td> 88</tr> 89</tbody> 90</table> 91<!-- .......................................................................... --> 92<pre class="literal-block"> 93typedef <a href="./less-equal.html" class="identifier">less_equal</a><c1,c2> r; 94</pre> 95<table class="docutils field-list" frame="void" rules="none"> 96<col class="field-name" /> 97<col class="field-body" /> 98<tbody valign="top"> 99<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> 100</td> 101</tr> 102<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> 103<pre class="last literal-block"> 104struct r : <a href="./less-equal.html" class="identifier">less_equal</a><c1,c2>::type {}; 105</pre> 106</td> 107</tr> 108</tbody> 109</table> 110</div> 111<div class="section" id="id1029"> 112<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> 113<p>Amortized constant time.</p> 114</div> 115<div class="section" id="id1030"> 116<h3><a class="subsection-title" href="#example" name="example">Example</a></h3> 117<pre class="literal-block"> 118<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./less-equal.html" class="identifier">less_equal</a>< <a href="./int.html" class="identifier">int_</a><0>, <a href="./int.html" class="identifier">int_</a><10> > )); 119<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./less-equal.html" class="identifier">less_equal</a>< <a href="./long.html" class="identifier">long_</a><10>, <a href="./int.html" class="identifier">int_</a><0> > )); 120<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./less-equal.html" class="identifier">less_equal</a>< <a href="./long.html" class="identifier">long_</a><10>, <a href="./int.html" class="identifier">int_</a><10> > )); 121</pre> 122</div> 123<div class="section" id="id1031"> 124<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 125<p><a class="reference internal" href="./comparisons.html">Comparisons</a>, <a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a>, <a class="reference internal" href="./numeric-cast.html">numeric_cast</a>, <a class="reference internal" href="./less.html">less</a>, <a class="reference internal" href="./greater.html">greater</a>, <a class="reference internal" href="./equal.html">equal</a></p> 126<!-- Metafunctions/Comparisons//greater |30 --> 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="./less.html" class="navigation-link">Prev</a> <a href="./greater.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./less.html" class="navigation-link">Back</a> <a href="./greater.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./comparisons.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> 133Distributed under the Boost Software License, Version 1.0. (See accompanying 134file 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> 136