<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Struct pop_front</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="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../../../proto/reference.html#header.boost.proto.fusion_hpp" title="Header <boost/proto/fusion.hpp>"> <link rel="prev" href="flatten/result_This_Expr____id1258491.html" title="Struct template result<This(Expr &)>"> <link rel="next" href="pop_front/result_This_Expr__id1258668.html" title="Struct template result<This(Expr)>"> </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 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name="boost.proto.functional.pop_front"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Struct pop_front</span></h2> <p>boost::proto::functional::pop_front — A <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> type that invokes the <code class="computeroutput">fusion::pop_front()</code> algorithm on its argument.</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="comment">// In header: <<a class="link" href="../../../proto/reference.html#header.boost.proto.fusion_hpp" title="Header <boost/proto/fusion.hpp>">boost/proto/fusion.hpp</a>> </span> <span class="keyword">struct</span> <a class="link" href="pop_front.html" title="Struct pop_front">pop_front</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="../callable.html" title="Struct callable">proto::callable</a> <span class="special">{</span> <span class="comment">// member classes/structs/unions</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> This<span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="pop_front/result_This_Expr__id1258668.html" title="Struct template result<This(Expr)>">result</a><span class="special"><</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">Expr</span><span class="special">)</span><span class="special">></span> <span class="special">:</span> <span class="keyword"></span> result< This(Expr const &) > <span class="special">{</span> <span class="special">}</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> This<span class="special">,</span> <span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="pop_front/result_This_Expr____id1258702.html" title="Struct template result<This(Expr &)>">result</a><span class="special"><</span><span class="identifier">This</span><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&</span><span class="special">)</span><span class="special">></span> <span class="special">:</span> <span class="keyword"></span> fusion::result_of::pop_front< Expr > <span class="special">{</span> <span class="special">}</span><span class="special">;</span> <span class="comment">// <a class="link" href="pop_front.html#id1258736-bb">public member functions</a></span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> <span class="keyword">typename</span> <span class="identifier">fusion</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">pop_front</span><span class="special"><</span> <span class="identifier">Expr</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="pop_front.html#id1258741-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> <span class="keyword">typename</span> <span class="identifier">fusion</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">pop_front</span><span class="special"><</span> <span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="pop_front.html#id1258781-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> <span class="special">}</span><span class="special">;</span></pre></div> <div class="refsect1"> <a name="id2301915"></a><h2>Description</h2> <p> A <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> type that invokes the <code class="computeroutput">fusion::pop_front()</code> algorithm on its argument. This is useful for defining a <a class="link" href="../../../CallableTransform.html" title="Concept CallableTransform">CallableTransform</a> such as <code class="computeroutput">pop_front(_)</code>, which removes the first child from a Proto expression node. Such a transform might be used as the first argument to the <code class="computeroutput"><a class="link" href="../fold.html" title="Struct template fold">proto::fold<></a></code> transform; that is, fold all but the first child. </p> <div class="refsect2"> <a name="id2301967"></a><h3> <a name="id1258736-bb"></a><code class="computeroutput">pop_front</code> public member functions</h3> <div class="orderedlist"><ol class="orderedlist" type="1"> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> <span class="keyword">typename</span> <span class="identifier">fusion</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">pop_front</span><span class="special"><</span> <span class="identifier">Expr</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="id1258741-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Expr</span> <span class="special">&</span> expr<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody><tr> <td><p><span class="term">Returns:</span></p></td> <td><p><code class="computeroutput">fusion::pop_front(expr)</code></p></td> </tr></tbody> </table></div> </li> <li class="listitem"> <pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <a class="link" href="../../../Expr.html" title="Concept Expr">Expr</a><span class="special">></span> <span class="keyword">typename</span> <span class="identifier">fusion</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">pop_front</span><span class="special"><</span> <span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">></span><span class="special">::</span><span class="identifier">type</span> <a name="id1258781-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Expr</span> <span class="keyword">const</span> <span class="special">&</span> expr<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody><tr> <td><p><span class="term">Returns:</span></p></td> <td><p><code class="computeroutput">fusion::pop_front(expr)</code></p></td> </tr></tbody> </table></div> </li> </ol></div> </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 © 2008 Eric Niebler<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="flatten/result_This_Expr____id1258491.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../proto/reference.html#header.boost.proto.fusion_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="pop_front/result_This_Expr__id1258668.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>