<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>find</title> <link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../../../../index.html" title="Chapter 1. Fusion 2.0"> <link rel="up" href="../functions.html" title="Functions"> <link rel="prev" href="none.html" title="none"> <link rel="next" href="find_if.html" title="find_if"> </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="../../../../../../../../libs/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="none.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.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="find_if.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section"> <div class="titlepage"><div><div><h5 class="title"> <a name="fusion.algorithm.query.functions.find"></a><a class="link" href="find.html" title="find">find</a> </h5></div></div></div> <a name="fusion.algorithm.query.functions.find.description"></a><h6> <a name="id1039418"></a> <a class="link" href="find.html#fusion.algorithm.query.functions.find.description">Description</a> </h6> <p> Finds the first element of a given type within a sequence. </p> <a name="fusion.algorithm.query.functions.find.synopsis"></a><h6> <a name="id1039435"></a> <a class="link" href="find.html#fusion.algorithm.query.functions.find.synopsis">Synopsis</a> </h6> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span> <span class="special">></span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">find</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">seq</span><span class="special">);</span> <span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span> <span class="special">></span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">find</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&</span> <span class="identifier">seq</span><span class="special">);</span> </pre> <div class="table"> <a name="id1039580"></a><p class="title"><b>Table 1.52. Parameters</b></p> <div class="table-contents"><table class="table" summary="Parameters"> <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">seq</span></code> </p> </td> <td> <p> A model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward Sequence</a> </p> </td> <td> <p> The sequence to search </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">T</span></code> </p> </td> <td> <p> Any type </p> </td> <td> <p> The type to search for </p> </td> </tr> </tbody> </table></div> </div> <br class="table-break"><a name="fusion.algorithm.query.functions.find.expression_semantics"></a><h6> <a name="id1039702"></a> <a class="link" href="find.html#fusion.algorithm.query.functions.find.expression_semantics">Expression Semantics</a> </h6> <pre class="programlisting"><a class="link" href="find.html" title="find"><code class="computeroutput"><span class="identifier">find</span></code></a><span class="special"><</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">seq</span><span class="special">)</span> </pre> <p> <span class="bold"><strong>Return type</strong></span>: A model of the same iterator category as the iterators of <code class="computeroutput"><span class="identifier">seq</span></code>. </p> <p> <span class="bold"><strong>Semantics</strong></span>: Returns an iterator to the first element of <code class="computeroutput"><span class="identifier">seq</span></code> of type <code class="computeroutput"><span class="identifier">T</span></code>, or <code class="computeroutput"><a class="link" href="../../../sequence/intrinsic/functions/end.html" title="end"><code class="computeroutput"><span class="identifier">end</span></code></a><span class="special">(</span><span class="identifier">seq</span><span class="special">)</span></code> if there is no such element. Equivalent to <code class="computeroutput"><a class="link" href="find_if.html" title="find_if"><code class="computeroutput"><span class="identifier">find_if</span></code></a><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special"><</span><span class="identifier">_</span><span class="special">,</span> <span class="identifier">T</span><span class="special">></span> <span class="special">>(</span><span class="identifier">seq</span><span class="special">)</span></code> </p> <a name="fusion.algorithm.query.functions.find.complexity"></a><h6> <a name="id1040962"></a> <a class="link" href="find.html#fusion.algorithm.query.functions.find.complexity">Complexity</a> </h6> <p> Linear. At most <code class="computeroutput"><a class="link" href="../../../sequence/intrinsic/metafunctions/size.html" title="size"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></code></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">>::</span><span class="identifier">value</span></code> comparisons. </p> <a name="fusion.algorithm.query.functions.find.header"></a><h6> <a name="id1041013"></a> <a class="link" href="find.html#fusion.algorithm.query.functions.find.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">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">find</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">find</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> </pre> <a name="fusion.algorithm.query.functions.find.example"></a><h6> <a name="id1041128"></a> <a class="link" href="find.html#fusion.algorithm.query.functions.find.example">Example</a> </h6> <pre class="programlisting"><span class="keyword">const</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">char</span><span class="special">,</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">vec</span><span class="special">(</span><span class="char">'a'</span><span class="special">,</span><span class="char">'0'</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(*</span><a class="link" href="find.html" title="find"><code class="computeroutput"><span class="identifier">find</span></code></a><span class="special"><</span><span class="keyword">int</span><span class="special">>(</span><span class="identifier">vec</span><span class="special">)</span> <span class="special">==</span> <span class="char">'0'</span><span class="special">);</span> <span class="identifier">assert</span><span class="special">(</span><a class="link" href="find.html" title="find"><code class="computeroutput"><span class="identifier">find</span></code></a><span class="special"><</span><span class="keyword">double</span><span class="special">>(</span><span class="identifier">vec</span><span class="special">)</span> <span class="special">==</span> <a class="link" href="../../../sequence/intrinsic/functions/end.html" title="end"><code class="computeroutput"><span class="identifier">end</span></code></a><span class="special">(</span><span class="identifier">vec</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="none.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.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="find_if.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>