1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Struct front</title> 6<link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="../../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="../../../xpressive/reference.html#header.boost.xpressive.regex_actions_hpp" title="Header <boost/xpressive/regex_actions.hpp>"> 10<link rel="prev" href="first/resul_1_3_47_5_3_2_1_2_3_3.html" title="Struct template result<This(Pair)>"> 11<link rel="next" href="front/result.html" title="Struct template result"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" 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alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="boost.xpressive.op.front"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Struct front</span></h2> 30<p>boost::xpressive::op::front — <code class="computeroutput">front</code> is a PolymorphicFunctionObject for fetching the front element of a container. </p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../../xpressive/reference.html#header.boost.xpressive.regex_actions_hpp" title="Header <boost/xpressive/regex_actions.hpp>">boost/xpressive/regex_actions.hpp</a>> 34 35</span> 36<span class="keyword">struct</span> <a class="link" href="front.html" title="Struct front">front</a> <span class="special">{</span> 37 <span class="comment">// member classes/structs/unions</span> 38 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Sig<span class="special">></span> 39 <span class="keyword">struct</span> <a class="link" href="front/result.html" title="Struct template result">result</a> <span class="special">{</span> 40 <span class="special">}</span><span class="special">;</span> 41 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> This<span class="special">,</span> <span class="keyword">typename</span> Sequence<span class="special">></span> 42 <span class="keyword">struct</span> <a class="link" href="front/resul_1_3_47_5_3_2_1_2_4_3.html" title="Struct template result<This(Sequence)>">result</a><span class="special"><</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">Sequence</span><span class="special">)</span><span class="special">></span> <span class="special">{</span> 43 <span class="comment">// types</span> 44 <span class="keyword">typedef</span> <span class="identifier">remove_reference</span><span class="special"><</span> <span class="identifier">Sequence</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="front/resul_1_3_47_5_3_2_1_2_4_3.html#boost.xpressive.op.front.resul_1_3_47_5_3_2_1_2_4_3.sequence_type"><span class="identifier">sequence_type</span></a><span class="special">;</span> 45 <span class="keyword">typedef</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">if_c</span><span class="special"><</span> <span class="identifier">is_const</span><span class="special"><</span> <span class="identifier">sequence_type</span> <span class="special">></span><span class="special">::</span><a class="link" href="../value.html" title="Struct template value">value</a><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">sequence_type</span><span class="special">::</span><span class="identifier">const_reference</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">sequence_type</span><span class="special">::</span><span class="identifier">reference</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="front/resul_1_3_47_5_3_2_1_2_4_3.html#boost.xpressive.op.front.resul_1_3_47_5_3_2_1_2_4_3.type"><span class="identifier">type</span></a><span class="special">;</span> 46 <span class="special">}</span><span class="special">;</span> 47 48 <span class="comment">// <a class="link" href="front.html#id-1_3_47_5_3_2_1_2_4_4-bb">public member functions</a></span> 49 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Sequence<span class="special">></span> 50 <a class="link" href="front/result.html" title="Struct template result">result</a><span class="special"><</span> <a class="link" href="front.html" title="Struct front">front</a><span class="special">(</span><span class="identifier">Sequence</span> <span class="special">&</span><span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="front.html#id-1_3_47_5_3_2_1_2_4_4_1-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Sequence</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 51<span class="special">}</span><span class="special">;</span></pre></div> 52<div class="refsect1"> 53<a name="id-1.3.47.5.4.7.4"></a><h2>Description</h2> 54<div class="refsect2"> 55<a name="id-1.3.47.5.4.7.4.2"></a><h3> 56<a name="id-1_3_47_5_3_2_1_2_4_4-bb"></a><code class="computeroutput">front</code> public member functions</h3> 57<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 58<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Sequence<span class="special">></span> 59 <a class="link" href="front/result.html" title="Struct template result">result</a><span class="special"><</span> <a class="link" href="front.html" title="Struct front">front</a><span class="special">(</span><span class="identifier">Sequence</span> <span class="special">&</span><span class="special">)</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="id-1_3_47_5_3_2_1_2_4_4_1-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="special">&</span> seq<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 60<p> 61 62</p> 63<div class="variablelist"><table border="0" class="variablelist compact"> 64<colgroup> 65<col align="left" valign="top"> 66<col> 67</colgroup> 68<tbody> 69<tr> 70<td><p><span class="term">Parameters:</span></p></td> 71<td><div class="variablelist"><table border="0" class="variablelist compact"> 72<colgroup> 73<col align="left" valign="top"> 74<col> 75</colgroup> 76<tbody><tr> 77<td><p><span class="term"><code class="computeroutput">seq</code></span></p></td> 78<td><p>The sequence from which to fetch the front. </p></td> 79</tr></tbody> 80</table></div></td> 81</tr> 82<tr> 83<td><p><span class="term">Returns:</span></p></td> 84<td><p><code class="computeroutput">seq.front()</code> </p></td> 85</tr> 86</tbody> 87</table></div> 88</li></ol></div> 89</div> 90</div> 91</div> 92<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 93<td align="left"></td> 94<td align="right"><div class="copyright-footer">Copyright © 2007 Eric Niebler<p> 95 Distributed under the Boost Software License, Version 1.0. (See accompanying 96 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>) 97 </p> 98</div></td> 99</tr></table> 100<hr> 101<div class="spirit-nav"> 102<a accesskey="p" href="first/resul_1_3_47_5_3_2_1_2_3_3.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../xpressive/reference.html#header.boost.xpressive.regex_actions_hpp"><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="front/result.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 103</div> 104</body> 105</html> 106
