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 empty</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="../../../proto/reference.html#header.boost.proto.functional.range.empty_hpp" title="Header <boost/proto/functional/range/empty.hpp>"> 10<link rel="prev" href="begin/resu_1_3_33_5_19_2_1_1_1_4.html" title="Struct template result<This(Range)>"> 11<link rel="next" href="end.html" title="Struct end"> 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" width="277" 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25</div> 26<div class="refentry"> 27<a name="boost.proto.functional.empty"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Struct empty</span></h2> 30<p>boost::proto::functional::empty — A <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> type that invokes the 31 <code class="computeroutput">boost::empty()</code> function on its arguments.</p> 32</div> 33<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 34<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.functional.range.empty_hpp" title="Header <boost/proto/functional/range/empty.hpp>">boost/proto/functional/range/empty.hpp</a>> 35 36</span> 37<span class="keyword">struct</span> <a class="link" href="empty.html" title="Struct empty">empty</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> 38 <span class="comment">// types</span> 39 <span class="keyword">typedef</span> <span class="keyword">bool</span> <a name="boost.proto.functional.empty.result_type"></a><span class="identifier">result_type</span><span class="special">;</span> 40 41 <span class="comment">// <a class="link" href="empty.html#id-1_3_33_5_20_2_1_1_1_5-bb">public member functions</a></span> 42 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Range<span class="special">></span> <span class="keyword">bool</span> <a class="link" href="empty.html#id-1_3_33_5_20_2_1_1_1_5_1-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Range</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> 43<span class="special">}</span><span class="special">;</span></pre></div> 44<div class="refsect1"> 45<a name="id-1.3.33.5.22.4.4"></a><h2>Description</h2> 46<p> 47 A <a class="link" href="../../../PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> type that invokes the 48 <code class="computeroutput">boost::empty()</code> function on its arguments.</p> 49<div class="refsect2"> 50<a name="id-1.3.33.5.22.4.4.3"></a><h3> 51<a name="id-1_3_33_5_20_2_1_1_1_5-bb"></a><code class="computeroutput">empty</code> public member functions</h3> 52<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 53<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Range<span class="special">></span> <span class="keyword">bool</span> <a name="id-1_3_33_5_20_2_1_1_1_5_1-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Range</span> <span class="keyword">const</span> <span class="special">&</span> rng<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre> 54<div class="variablelist"><table border="0" class="variablelist compact"> 55<colgroup> 56<col align="left" valign="top"> 57<col> 58</colgroup> 59<tbody><tr> 60<td><p><span class="term">Returns:</span></p></td> 61<td><p><code class="computeroutput">boost::empty(rng)</code></p></td> 62</tr></tbody> 63</table></div> 64</li></ol></div> 65</div> 66</div> 67</div> 68<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 69<td align="left"></td> 70<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p> 71 Distributed under the Boost Software License, Version 1.0. (See accompanying 72 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>) 73 </p> 74</div></td> 75</tr></table> 76<hr> 77<div class="spirit-nav"> 78<a accesskey="p" href="begin/resu_1_3_33_5_19_2_1_1_1_4.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../../proto/reference.html#header.boost.proto.functional.range.empty_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="end.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 79</div> 80</body> 81</html> 82
