1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>less than</title> 5<link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../../index.html" title="Chapter 1. Fusion 2.2"> 8<link rel="up" href="../comparison.html" title="Comparison"> 9<link rel="prev" href="not_equal.html" title="not equal"> 10<link rel="next" href="less_than_equal.html" title="less than equal"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="not_equal.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../comparison.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="less_than_equal.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="fusion.sequence.operator.comparison.less_than"></a><a class="link" href="less_than.html" title="less than">less 28 than</a> 29</h5></div></div></div> 30<p> 31 Lexicographically compare two sequences. 32 </p> 33<h6> 34<a name="fusion.sequence.operator.comparison.less_than.h0"></a> 35 <span class="phrase"><a name="fusion.sequence.operator.comparison.less_than.synopsis"></a></span><a class="link" href="less_than.html#fusion.sequence.operator.comparison.less_than.synopsis">Synopsis</a> 36 </h6> 37<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Seq1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Seq2</span><span class="special">></span> 38<span class="keyword">bool</span> 39<span class="keyword">operator</span><span class="special"><(</span><span class="identifier">Seq1</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">Seq2</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">b</span><span class="special">);</span> 40</pre> 41<h6> 42<a name="fusion.sequence.operator.comparison.less_than.h1"></a> 43 <span class="phrase"><a name="fusion.sequence.operator.comparison.less_than.parameters"></a></span><a class="link" href="less_than.html#fusion.sequence.operator.comparison.less_than.parameters">Parameters</a> 44 </h6> 45<div class="informaltable"><table class="table"> 46<colgroup> 47<col> 48<col> 49<col> 50</colgroup> 51<thead><tr> 52<th> 53 <p> 54 Parameter 55 </p> 56 </th> 57<th> 58 <p> 59 Requirement 60 </p> 61 </th> 62<th> 63 <p> 64 Description 65 </p> 66 </th> 67</tr></thead> 68<tbody><tr> 69<td> 70 <p> 71 <code class="computeroutput"><span class="identifier">a</span><span class="special">,</span> 72 <span class="identifier">b</span></code> 73 </p> 74 </td> 75<td> 76 <p> 77 Instances of <a class="link" href="../../../sequence.html" title="Sequence">Sequence</a> 78 </p> 79 </td> 80<td> 81 <p> 82 <a class="link" href="../../../sequence.html" title="Sequence">Sequence</a>(s) to compare 83 </p> 84 </td> 85</tr></tbody> 86</table></div> 87<h6> 88<a name="fusion.sequence.operator.comparison.less_than.h2"></a> 89 <span class="phrase"><a name="fusion.sequence.operator.comparison.less_than.expression_semantics"></a></span><a class="link" href="less_than.html#fusion.sequence.operator.comparison.less_than.expression_semantics">Expression 90 Semantics</a> 91 </h6> 92<pre class="programlisting"><span class="identifier">a</span> <span class="special"><</span> <span class="identifier">b</span> 93</pre> 94<p> 95 <span class="bold"><strong>Return type</strong></span>: <code class="computeroutput"><span class="keyword">bool</span></code> 96 </p> 97<p> 98 <span class="bold"><strong>Requirements</strong></span>: 99 </p> 100<p> 101 For each element, <code class="computeroutput"><span class="identifier">e1</span></code>, 102 in sequence <code class="computeroutput"><span class="identifier">a</span></code>, and for 103 each element, <code class="computeroutput"><span class="identifier">e2</span></code>, in 104 sequence <code class="computeroutput"><span class="identifier">b</span></code>, <code class="computeroutput"><span class="identifier">a</span> <span class="special"><</span> <span class="identifier">b</span></code> is a valid expression returning a 105 type that is convertible to bool. 106 </p> 107<p> 108 An attempt to compare two Sequences of different lengths results in a 109 compile time error. 110 </p> 111<p> 112 <span class="bold"><strong>Semantics</strong></span>: Returns the lexicographical 113 comparison of between <code class="computeroutput"><span class="identifier">a</span></code> 114 and <code class="computeroutput"><span class="identifier">b</span></code>. 115 </p> 116<h6> 117<a name="fusion.sequence.operator.comparison.less_than.h3"></a> 118 <span class="phrase"><a name="fusion.sequence.operator.comparison.less_than.header"></a></span><a class="link" href="less_than.html#fusion.sequence.operator.comparison.less_than.header">Header</a> 119 </h6> 120<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">sequence</span><span class="special">/</span><span class="identifier">comparison</span><span class="special">/</span><span class="identifier">less</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 121<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">less</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 122</pre> 123<h6> 124<a name="fusion.sequence.operator.comparison.less_than.h4"></a> 125 <span class="phrase"><a name="fusion.sequence.operator.comparison.less_than.example"></a></span><a class="link" href="less_than.html#fusion.sequence.operator.comparison.less_than.example">Example</a> 126 </h6> 127<pre class="programlisting"><a class="link" href="../../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">float</span><span class="special">></span> <span class="identifier">v1</span><span class="special">(</span><span class="number">4</span><span class="special">,</span> <span class="number">3.3f</span><span class="special">);</span> 128<a class="link" href="../../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">short</span><span class="special">,</span> <span class="keyword">float</span><span class="special">></span> <span class="identifier">v2</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">3.3f</span><span class="special">);</span> 129<a class="link" href="../../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">long</span><span class="special">,</span> <span class="keyword">double</span><span class="special">></span> <span class="identifier">v3</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">4.4</span><span class="special">);</span> 130<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v1</span> <span class="special"><</span> <span class="identifier">v2</span><span class="special">);</span> 131<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v2</span> <span class="special"><</span> <span class="identifier">v3</span><span class="special">);</span> 132</pre> 133</div> 134<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 135<td align="left"></td> 136<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman, 137 Dan Marsden, Tobias Schwinger<p> 138 Distributed under the Boost Software License, Version 1.0. (See accompanying 139 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 140 </p> 141</div></td> 142</tr></table> 143<hr> 144<div class="spirit-nav"> 145<a accesskey="p" href="not_equal.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../comparison.html"><img src="../../../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="less_than_equal.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 146</div> 147</body> 148</html> 149
