<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>swap</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="at_key.html" title="at_key"> <link rel="next" href="../metafunctions.html" title="Metafunctions"> </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 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name="fusion.sequence.intrinsic.functions.swap.description"></a><h6> <a name="id927242"></a> <a class="link" href="swap.html#fusion.sequence.intrinsic.functions.swap.description">Description</a> </h6> <p> Performs an element by element swap of the elements in 2 sequences. </p> <a name="fusion.sequence.intrinsic.functions.swap.synopsis"></a><h6> <a name="id927259"></a> <a class="link" href="swap.html#fusion.sequence.intrinsic.functions.swap.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">void</span> <span class="identifier">swap</span><span class="special">(</span><span class="identifier">Seq1</span><span class="special">&</span> <span class="identifier">seq1</span><span class="special">,</span> <span class="identifier">Seq2</span><span class="special">&</span> <span class="identifier">seq2</span><span class="special">);</span> </pre> <a name="fusion.sequence.intrinsic.functions.swap.parameters"></a><h6> <a name="id927355"></a> <a class="link" href="swap.html#fusion.sequence.intrinsic.functions.swap.parameters">Parameters</a> </h6> <div class="informaltable"><table class="table"> <colgroup> <col> <col> <col> </colgroup> <thead><tr> <th> <p> Parameters </p> </th> <th> <p> Requirement </p> </th> <th> <p> Description </p> </th> </tr></thead> <tbody><tr> <td> <p> <code class="computeroutput"><span class="identifier">seq1</span></code>, <code class="computeroutput"><span class="identifier">seq2</span></code> </p> </td> <td> <p> Models of <a class="link" href="../../concepts/forward_sequence.html" title="Forward Sequence">Forward Sequence</a> </p> </td> <td> <p> The sequences whos elements we wish to swap. </p> </td> </tr></tbody> </table></div> <a name="fusion.sequence.intrinsic.functions.swap.expression_semantics"></a><h6> <a name="id927457"></a> <a class="link" href="swap.html#fusion.sequence.intrinsic.functions.swap.expression_semantics">Expression Semantics</a> </h6> <pre class="programlisting"><span class="identifier">swap</span><span class="special">(</span><span class="identifier">seq1</span><span class="special">,</span> <span class="identifier">seq2</span><span class="special">);</span> </pre> <p> <span class="bold"><strong>Return type</strong></span>: <code class="computeroutput"><span class="keyword">void</span></code> </p> <p> <span class="bold"><strong>Precondition</strong></span>: <code class="computeroutput"><a class="link" href="size.html" title="size"><code class="computeroutput"><span class="identifier">size</span></code></a><span class="special">(</span><span class="identifier">seq1</span><span class="special">)</span> <span class="special">==</span> <a class="link" href="size.html" title="size"><code class="computeroutput"><span class="identifier">size</span></code></a><span class="special">(</span><span class="identifier">seq2</span><span class="special">)</span></code> </p> <p> <span class="bold"><strong>Semantics</strong></span>: Calls <code class="computeroutput"><span class="identifier">swap</span><span class="special">(</span><span class="identifier">a1</span><span class="special">,</span> <span class="identifier">b1</span><span class="special">)</span></code> for corresponding elements in <code class="computeroutput"><span class="identifier">seq1</span></code> and <code class="computeroutput"><span class="identifier">seq2</span></code>. </p> <p> /sequence/intrinsic/swap.hpp> </p> <a name="fusion.sequence.intrinsic.functions.swap.example"></a><h6> <a name="id927625"></a> <a class="link" href="swap.html#fusion.sequence.intrinsic.functions.swap.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="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="identifier">v1</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="string">"hello"</span><span class="special">),</span> <span class="identifier">v2</span><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="string">"world"</span><span class="special">);</span> <span class="identifier">swap</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">v1</span> <span class="special">==</span> <a class="link" href="../../../container/generation/functions/make_vector.html" title="make_vector"><code class="computeroutput"><span class="identifier">make_vector</span></code></a><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="string">"world"</span><span class="special">));</span> <span class="identifier">assert</span><span class="special">(</span><span class="identifier">v2</span> <span class="special">==</span> <a class="link" href="../../../container/generation/functions/make_vector.html" title="make_vector"><code class="computeroutput"><span class="identifier">make_vector</span></code></a><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="string">"hello"</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 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