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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 0.3.6: http://docutils.sourceforge.net/" />
7<title>The MPL Reference Manual: less</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="./comparisons.html" class="navigation-link">Prev</a>&nbsp;<a href="./less-equal.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group">Back&nbsp;<a href="./less-equal.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./comparisons.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</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.html" class="navigation-link">less</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="less">
15<h1><a class="toc-backref" href="./comparisons.html#id469" name="less">less</a></h1>
16<div class="section" id="less-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename T1
21    , typename T2
22    &gt;
23struct <a href="./less.html" class="identifier">less</a>
24{
25    typedef <em>unspecified</em> type;
26};
27</pre>
28</div>
29<div class="section" id="less-description">
30<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
31<p>Returns a true-valued <a class="reference" href="./integral-constant.html">Integral Constant</a> if <tt class="literal"><span class="pre">T1</span></tt> is less than <tt class="literal"><span class="pre">T2</span></tt>.</p>
32</div>
33<div class="section" id="less-header">
34<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
35<pre class="literal-block">
36#include &lt;<a href="../../../../boost/mpl/less.hpp" class="header">boost/mpl/less.hpp</a>&gt;
37#include &lt;<a href="../../../../boost/mpl/comparison.hpp" class="header">boost/mpl/comparison.hpp</a>&gt;
38</pre>
39</div>
40<div class="section" id="less-model-of">
41<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
42<p><a class="reference" href="./numeric-metafunction.html">Numeric Metafunction</a></p>
43</div>
44<div class="section" id="less-parameters">
45<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
46<table border="1" class="table">
47<colgroup>
48<col width="17%" />
49<col width="30%" />
50<col width="53%" />
51</colgroup>
52<thead valign="bottom">
53<tr><th>Parameter</th>
54<th>Requirement</th>
55<th>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" 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" 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" href="./integral-constant.html">Integral Constant</a> requirements. — <em>end note</em>]</p>
69</div>
70<div class="section" id="less-expression-semantics">
71<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
72<p>For any <a class="reference" 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.html" class="identifier">less</a>&lt;c1,c2&gt;::type r;
75</pre>
76<table class="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"><a class="reference" href="./integral-constant.html">Integral Constant</a>.</td>
81</tr>
82<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
83<pre class="last literal-block">
84typedef <a href="./bool.html" class="identifier">bool_</a>&lt; (c1::value &lt; c2::value) &gt; r;
85</pre>
86</td>
87</tr>
88</tbody>
89</table>
90<!-- .......................................................................... -->
91<pre class="literal-block">
92typedef <a href="./less.html" class="identifier">less</a>&lt;c1,c2&gt; r;
93</pre>
94<table class="field-list" frame="void" rules="none">
95<col class="field-name" />
96<col class="field-body" />
97<tbody valign="top">
98<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference" href="./integral-constant.html">Integral Constant</a>.</td>
99</tr>
100<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
101<pre class="last literal-block">
102struct r : <a href="./less.html" class="identifier">less</a>&lt;c1,c2&gt;::type {};
103</pre>
104</td>
105</tr>
106</tbody>
107</table>
108</div>
109<div class="section" id="less-complexity">
110<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
111<p>Amortized constant time.</p>
112</div>
113<div class="section" id="less-example">
114<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
115<pre class="literal-block">
116<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./less.html" class="identifier">less</a>&lt; <a href="./int.html" class="identifier">int_</a>&lt;0&gt;, <a href="./int.html" class="identifier">int_</a>&lt;10&gt; &gt; ));
117<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./less.html" class="identifier">less</a>&lt; <a href="./long.html" class="identifier">long_</a>&lt;10&gt;, <a href="./int.html" class="identifier">int_</a>&lt;0&gt; &gt; ));
118<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./less.html" class="identifier">less</a>&lt; <a href="./long.html" class="identifier">long_</a>&lt;10&gt;, <a href="./int.html" class="identifier">int_</a>&lt;10&gt; > ));
119</pre>
120</div>
121<div class="section" id="less-see-also">
122<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
123<p><a class="reference" href="./comparisons.html">Comparisons</a>, <a class="reference" href="./numeric-metafunction.html">Numeric Metafunction</a>, <a class="refentry reference" href="./numeric-cast.html"><tt class="refentry literal"><span class="pre">numeric_cast</span></tt></a>, <a class="refentry reference" href="./less-equal.html"><tt class="refentry literal"><span class="pre">less_equal</span></tt></a>, <a class="refentry reference" href="./greater.html"><tt class="refentry literal"><span class="pre">greater</span></tt></a>, <a class="refentry reference" href="./equal.html"><tt class="refentry literal"><span class="pre">equal</span></tt></a></p>
124<!-- modtime: November 10, 2004 04:38:48 +0000 -->
125<!-- Metafunctions/Comparisons//less_equal |20 -->
126</div>
127</div>
128
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