1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>flatten</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="../functions.html" title="Functions"> 9<link rel="prev" href="push_front.html" title="push_front"> 10<link rel="next" href="../metafunctions.html" title="Metafunctions"> 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="push_front.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="../metafunctions.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.algorithm.transformation.functions.flatten"></a><a class="link" href="flatten.html" title="flatten">flatten</a> 28</h5></div></div></div> 29<h6> 30<a name="fusion.algorithm.transformation.functions.flatten.h0"></a> 31 <span class="phrase"><a name="fusion.algorithm.transformation.functions.flatten.description"></a></span><a class="link" href="flatten.html#fusion.algorithm.transformation.functions.flatten.description">Description</a> 32 </h6> 33<p> 34 Returns a new sequence without nested sequences. 35 </p> 36<h6> 37<a name="fusion.algorithm.transformation.functions.flatten.h1"></a> 38 <span class="phrase"><a name="fusion.algorithm.transformation.functions.flatten.synopsis"></a></span><a class="link" href="flatten.html#fusion.algorithm.transformation.functions.flatten.synopsis">Synopsis</a> 39 </h6> 40<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> 41 <span class="keyword">typename</span> <span class="identifier">Sequence</span> 42 <span class="special">></span> 43<span class="keyword">typename</span> <a class="link" href="../metafunctions/flatten.html" title="flatten"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">flatten</span></code></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">flatten</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">&</span> <span class="identifier">seq</span><span class="special">);</span> 44 45<span class="keyword">template</span><span class="special"><</span> 46 <span class="keyword">typename</span> <span class="identifier">Sequence</span> 47 <span class="special">></span> 48<span class="keyword">typename</span> <a class="link" href="../metafunctions/flatten.html" title="flatten"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">flatten</span></code></a><span class="special"><</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">flatten</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> 49</pre> 50<div class="table"> 51<a name="fusion.algorithm.transformation.functions.flatten.t0"></a><p class="title"><b>Table 1.86. Parameters</b></p> 52<div class="table-contents"><table class="table" summary="Parameters"> 53<colgroup> 54<col> 55<col> 56<col> 57</colgroup> 58<thead><tr> 59<th> 60 <p> 61 Parameter 62 </p> 63 </th> 64<th> 65 <p> 66 Requirement 67 </p> 68 </th> 69<th> 70 <p> 71 Description 72 </p> 73 </th> 74</tr></thead> 75<tbody><tr> 76<td> 77 <p> 78 <code class="computeroutput"><span class="identifier">seq</span></code> 79 </p> 80 </td> 81<td> 82 <p> 83 A model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward 84 Sequence</a> 85 </p> 86 </td> 87<td> 88 <p> 89 Operation's argument 90 </p> 91 </td> 92</tr></tbody> 93</table></div> 94</div> 95<br class="table-break"><h6> 96<a name="fusion.algorithm.transformation.functions.flatten.h2"></a> 97 <span class="phrase"><a name="fusion.algorithm.transformation.functions.flatten.expression_semantics"></a></span><a class="link" href="flatten.html#fusion.algorithm.transformation.functions.flatten.expression_semantics">Expression 98 Semantics</a> 99 </h6> 100<pre class="programlisting"><a class="link" href="flatten.html" title="flatten"><code class="computeroutput"><span class="identifier">flatten</span></code></a><span class="special">(</span><span class="identifier">seq</span><span class="special">);</span> 101</pre> 102<p> 103 <span class="bold"><strong>Return type</strong></span>: 104 </p> 105<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 106 A model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward 107 Sequence</a>. 108 </li></ul></div> 109<p> 110 <span class="bold"><strong>Semantics</strong></span>: Returns a new sequence containing 111 all the leaf elements of <code class="computeroutput"><span class="identifier">seq</span></code>. 112 </p> 113<h6> 114<a name="fusion.algorithm.transformation.functions.flatten.h3"></a> 115 <span class="phrase"><a name="fusion.algorithm.transformation.functions.flatten.complexity"></a></span><a class="link" href="flatten.html#fusion.algorithm.transformation.functions.flatten.complexity">Complexity</a> 116 </h6> 117<p> 118 Constant. Returns a view which is lazily evaluated. 119 </p> 120<h6> 121<a name="fusion.algorithm.transformation.functions.flatten.h4"></a> 122 <span class="phrase"><a name="fusion.algorithm.transformation.functions.flatten.header"></a></span><a class="link" href="flatten.html#fusion.algorithm.transformation.functions.flatten.header">Header</a> 123 </h6> 124<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">transformation</span><span class="special">/</span><span class="identifier">flatten</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 125<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">flatten</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 126</pre> 127<h6> 128<a name="fusion.algorithm.transformation.functions.flatten.h5"></a> 129 <span class="phrase"><a name="fusion.algorithm.transformation.functions.flatten.example"></a></span><a class="link" href="flatten.html#fusion.algorithm.transformation.functions.flatten.example">Example</a> 130 </h6> 131<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">int</span><span class="special">,</span> <span class="keyword">int</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">int</span><span class="special">,</span> <span class="keyword">int</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="number">1</span><span class="special">,</span> <span class="number">2</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">3</span><span class="special">,</span> <span class="number">4</span><span class="special">),</span> <span class="number">5</span><span class="special">);</span> 132<span class="identifier">assert</span><span class="special">(</span><a class="link" href="flatten.html" title="flatten"><code class="computeroutput"><span class="identifier">flatten</span></code></a><span class="special">(</span><span class="identifier">vec</span><span class="special">)</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="number">2</span><span class="special">,</span> <span class="number">3</span><span class="special">,</span> <span class="number">4</span><span class="special">,</span> <span class="number">5</span><span class="special">)));</span> 133</pre> 134</div> 135<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 136<td align="left"></td> 137<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman, 138 Dan Marsden, Tobias Schwinger<p> 139 Distributed under the Boost Software License, Version 1.0. (See accompanying 140 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>) 141 </p> 142</div></td> 143</tr></table> 144<hr> 145<div class="spirit-nav"> 146<a accesskey="p" href="push_front.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="../metafunctions.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 147</div> 148</body> 149</html> 150
