1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>none</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="../metafunctions.html" title="Metafunctions"> 9<link rel="prev" href="all.html" title="all"> 10<link rel="next" href="find.html" title="find"> 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="all.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.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="find.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.query.metafunctions.none"></a><a class="link" href="none.html" title="none">none</a> 28</h5></div></div></div> 29<h6> 30<a name="fusion.algorithm.query.metafunctions.none.h0"></a> 31 <span class="phrase"><a name="fusion.algorithm.query.metafunctions.none.description"></a></span><a class="link" href="none.html#fusion.algorithm.query.metafunctions.none.description">Description</a> 32 </h6> 33<p> 34 A metafunction returning the result type of <a class="link" href="../functions/none.html" title="none"><code class="computeroutput"><span class="identifier">none</span></code></a>. 35 </p> 36<h6> 37<a name="fusion.algorithm.query.metafunctions.none.h1"></a> 38 <span class="phrase"><a name="fusion.algorithm.query.metafunctions.none.synopsis"></a></span><a class="link" href="none.html#fusion.algorithm.query.metafunctions.none.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><span class="special">,</span> 42 <span class="keyword">typename</span> <span class="identifier">F</span> 43 <span class="special">></span> 44<span class="keyword">struct</span> <span class="identifier">none</span> 45<span class="special">{</span> 46 <span class="keyword">typedef</span> <span class="keyword">bool</span> <span class="identifier">type</span><span class="special">;</span> 47<span class="special">};</span> 48</pre> 49<div class="table"> 50<a name="fusion.algorithm.query.metafunctions.none.t0"></a><p class="title"><b>Table 1.61. Parameters</b></p> 51<div class="table-contents"><table class="table" summary="Parameters"> 52<colgroup> 53<col> 54<col> 55<col> 56</colgroup> 57<thead><tr> 58<th> 59 <p> 60 Parameter 61 </p> 62 </th> 63<th> 64 <p> 65 Requirement 66 </p> 67 </th> 68<th> 69 <p> 70 Description 71 </p> 72 </th> 73</tr></thead> 74<tbody> 75<tr> 76<td> 77 <p> 78 <code class="computeroutput"><span class="identifier">Sequence</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> 93<tr> 94<td> 95 <p> 96 <code class="computeroutput"><span class="identifier">F</span></code> 97 </p> 98 </td> 99<td> 100 <p> 101 A model of unary <a class="link" href="../../../functional/concepts/poly.html" title="Polymorphic Function Object">Polymorphic 102 Function Object</a> 103 </p> 104 </td> 105<td> 106 <p> 107 Operation's argument 108 </p> 109 </td> 110</tr> 111</tbody> 112</table></div> 113</div> 114<br class="table-break"><h6> 115<a name="fusion.algorithm.query.metafunctions.none.h2"></a> 116 <span class="phrase"><a name="fusion.algorithm.query.metafunctions.none.expression_semantics"></a></span><a class="link" href="none.html#fusion.algorithm.query.metafunctions.none.expression_semantics">Expression 117 Semantics</a> 118 </h6> 119<pre class="programlisting"><a class="link" href="none.html" title="none"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">none</span></code></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</span><span class="special">>::</span><span class="identifier">type</span> 120</pre> 121<p> 122 <span class="bold"><strong>Return type</strong></span>: <code class="computeroutput"><span class="keyword">bool</span></code>. 123 </p> 124<p> 125 <span class="bold"><strong>Semantics</strong></span>: Returns the return type of 126 <a class="link" href="../functions/none.html" title="none"><code class="computeroutput"><span class="identifier">none</span></code></a> 127 given a sequence of type <code class="computeroutput"><span class="identifier">Sequence</span></code> 128 and a unary <a class="link" href="../../../functional/concepts/poly.html" title="Polymorphic Function Object">Polymorphic 129 Function Object</a> of type <code class="computeroutput"><span class="identifier">F</span></code>. 130 The return type is always <code class="computeroutput"><span class="keyword">bool</span></code>. 131 </p> 132<h6> 133<a name="fusion.algorithm.query.metafunctions.none.h3"></a> 134 <span class="phrase"><a name="fusion.algorithm.query.metafunctions.none.complexity"></a></span><a class="link" href="none.html#fusion.algorithm.query.metafunctions.none.complexity">Complexity</a> 135 </h6> 136<p> 137 Constant. 138 </p> 139<h6> 140<a name="fusion.algorithm.query.metafunctions.none.h4"></a> 141 <span class="phrase"><a name="fusion.algorithm.query.metafunctions.none.header"></a></span><a class="link" href="none.html#fusion.algorithm.query.metafunctions.none.header">Header</a> 142 </h6> 143<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">query</span><span class="special">/</span><span class="identifier">none</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 144<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">none</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 145</pre> 146</div> 147<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 148<td align="left"></td> 149<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman, 150 Dan Marsden, Tobias Schwinger<p> 151 Distributed under the Boost Software License, Version 1.0. (See accompanying 152 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>) 153 </p> 154</div></td> 155</tr></table> 156<hr> 157<div class="spirit-nav"> 158<a accesskey="p" href="all.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.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="find.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 159</div> 160</body> 161</html> 162
