<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Function template join_if</title> <link rel="stylesheet" href="../../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../string_algo/reference.html#header.boost.algorithm.string.join_hpp" title="Header <boost/algorithm/string/join.hpp>"> <link rel="prev" href="join.html" title="Function template join"> <link rel="next" href="starts_with.html" title="Function starts_with"> </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="join.html"><img src="../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../string_algo/reference.html#header.boost.algorithm.string.join_hpp"><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="starts_with.html"><img src="../../../../doc/html/images/next.png" alt="Next"></a> </div> <div class="refentry" title="Function template join_if"> <a name="boost.algorithm.join_if_id1147818"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Function template join_if</span></h2> <p>boost::algorithm::join_if — Conditional join algorithm. </p> </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="emphasis"><em>// In header: <<a class="link" href="../../string_algo/reference.html#header.boost.algorithm.string.join_hpp" title="Header <boost/algorithm/string/join.hpp>">boost/algorithm/string/join.hpp</a>> </em></span> <span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> SequenceSequenceT, <span class="bold"><strong>typename</strong></span> Range1T, <span class="bold"><strong>typename</strong></span> PredicateT> <span class="type">range_value< SequenceSequenceT >::type</span> join_if(<span class="bold"><strong>const</strong></span> SequenceSequenceT & Input, <span class="bold"><strong>const</strong></span> Range1T & Separator, PredicateT Pred);</pre></div> <div class="refsect1" title="Description"> <a name="id1740648"></a><h2>Description</h2> <p>This algorithm joins all strings in a 'list' into one long string. Segments are concatenated by given separator. Only segments that satisfy the predicate will be added to the result.</p> <p> </p> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody> <tr> <td><p><span class="term">Parameters:</span></p></td> <td><div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody> <tr> <td><p><span class="term"><code class="computeroutput">Input</code></span></p></td> <td><p>A container that holds the input strings. It must be a container-of-containers. </p></td> </tr> <tr> <td><p><span class="term"><code class="computeroutput">Pred</code></span></p></td> <td><p>A segment selection predicate </p></td> </tr> <tr> <td><p><span class="term"><code class="computeroutput">Separator</code></span></p></td> <td><p>A string that will separate the joined segments. </p></td> </tr> </tbody> </table></div></td> </tr> <tr> <td><p><span class="term">Returns:</span></p></td> <td><p>Concatenated string.</p></td> </tr> <tr> <td><p><span class="term">Notes:</span></p></td> <td><p>This function provides the strong exception-safety guarantee </p></td> </tr> </tbody> </table></div> </div> </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 © 2002-2004 Pavol Droba<p>Use, modification and distribution is subject to the Boost Software License, Version 1.0. (See accompanying file <code class="filename">LICENSE_1_0.txt</code> 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="join.html"><img src="../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../string_algo/reference.html#header.boost.algorithm.string.join_hpp"><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="starts_with.html"><img src="../../../../doc/html/images/next.png" alt="Next"></a> </div> </body> </html>