<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>less than</title> <link rel="stylesheet" href="../../../../../../../../doc/html/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.1"> <link rel="home" href="../../../../index.html" title="Chapter 1. Fusion 2.0"> <link rel="up" href="../comparison.html" title="Comparison"> <link rel="prev" href="not_equal.html" title="not equal"> <link rel="next" href="less_than_equal.html" title="less than equal"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> <td align="center"><a href="../../../../../../../../index.html">Home</a></td> <td align="center"><a href="../../../../../../../libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="not_equal.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../comparison.html"><img src="../../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="less_than_equal.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a> </div> <div class="section" title="less than"> <div class="titlepage"><div><div><h5 class="title"> <a name="fusion.sequence.operator.comparison.less_than"></a><a class="link" href="less_than.html" title="less than">less than</a> </h5></div></div></div> <p> Lexicographically compare two sequences. </p> <a name="fusion.sequence.operator.comparison.less_than.synopsis"></a><h6> <a name="id681599"></a> <a class="link" href="less_than.html#fusion.sequence.operator.comparison.less_than.synopsis">Synopsis</a> </h6> <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> <span class="keyword">bool</span> <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> </pre> <a name="fusion.sequence.operator.comparison.less_than.parameters"></a><h6> <a name="id681708"></a> <a class="link" href="less_than.html#fusion.sequence.operator.comparison.less_than.parameters">Parameters</a> </h6> <div class="informaltable"><table class="table"> <colgroup> <col> <col> <col> </colgroup> <thead><tr> <th> <p> Parameter </p> </th> <th> <p> Requirement </p> </th> <th> <p> Description </p> </th> </tr></thead> <tbody><tr> <td> <p> <code class="computeroutput"><span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</span></code> </p> </td> <td> <p> Instances of <a class="link" href="../../../sequence.html" title="Sequence">Sequence</a> </p> </td> <td> <p> <a class="link" href="../../../sequence.html" title="Sequence">Sequence</a>(s) to compare </p> </td> </tr></tbody> </table></div> <a name="fusion.sequence.operator.comparison.less_than.expression_semantics"></a><h6> <a name="id681812"></a> <a class="link" href="less_than.html#fusion.sequence.operator.comparison.less_than.expression_semantics">Expression Semantics</a> </h6> <pre class="programlisting"><span class="identifier">a</span> <span class="special"><</span> <span class="identifier">b</span> </pre> <p> <span class="bold"><strong>Return type</strong></span>: <code class="computeroutput"><span class="keyword">bool</span></code> </p> <p> <span class="bold"><strong>Requirements</strong></span>: </p> <p> For each element, <code class="computeroutput"><span class="identifier">e1</span></code>, in sequence <code class="computeroutput"><span class="identifier">a</span></code>, and for each element, <code class="computeroutput"><span class="identifier">e2</span></code>, in 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 type that is convertible to bool. </p> <p> An attempt to compare two Sequences of different lengths results in a compile time error. </p> <p> <span class="bold"><strong>Semantics</strong></span>: Returns the lexicographical comparison of between <code class="computeroutput"><span class="identifier">a</span></code> and <code class="computeroutput"><span class="identifier">b</span></code>. </p> <a name="fusion.sequence.operator.comparison.less_than.header"></a><h6> <a name="id681942"></a> <a class="link" href="less_than.html#fusion.sequence.operator.comparison.less_than.header">Header</a> </h6> <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> <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> </pre> <a name="fusion.sequence.operator.comparison.less_than.example"></a><h6> <a name="id682058"></a> <a class="link" href="less_than.html#fusion.sequence.operator.comparison.less_than.example">Example</a> </h6> <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> <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> <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> <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> <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> </pre> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias Schwinger<p> Distributed under the Boost Software License, Version 1.0. (See accompanying 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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="not_equal.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../comparison.html"><img src="../../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="less_than_equal.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a> </div> </body> </html>