<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>none</title> <link rel="stylesheet" href="../../../../../../../../doc/html/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.1"> <link rel="home" href="../../../../index.html" title="Chapter 1. Fusion 2.0"> <link rel="up" href="../functions.html" title="Functions"> <link rel="prev" href="all.html" title="all"> <link rel="next" href="find.html" title="find"> </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 href="../../../../../../../../index.html">Home</a></td> <td align="center"><a href="../../../../../../../libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td 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href="none.html#fusion.algorithm.query.functions.none.description">Description</a> </h6> <p> For a sequence <code class="computeroutput"><span class="identifier">seq</span></code> and unary function object <code class="computeroutput"><span class="identifier">f</span></code>, <code class="computeroutput"><span class="identifier">none</span></code> returns true if <code class="computeroutput"><span class="identifier">f</span></code> returns false for every element of <code class="computeroutput"><span class="identifier">seq</span></code>. </p> <a name="fusion.algorithm.query.functions.none.synopsis"></a><h6> <a name="id752874"></a> <a class="link" href="none.html#fusion.algorithm.query.functions.none.synopsis">Synopsis</a> </h6> <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">F</span> <span class="special">></span> <span class="keyword">typename</span> <a class="link" href="../metafunctions/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> <span class="identifier">none</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> <span class="identifier">F</span> <span class="identifier">f</span><span class="special">);</span> </pre> <div class="table"> <a name="id753009"></a><p class="title"><b>Table 1.45. Parameters</b></p> <div class="table-contents"><table class="table" summary="Parameters"> <colgroup> <col> <col> <col> </colgroup> <thead><tr> <th> <p> Parameter </p> </th> <th> <p> Requirement </p> </th> <th> <p> Description </p> </th> </tr></thead> <tbody> <tr> <td> <p> <code class="computeroutput"><span class="identifier">seq</span></code> </p> </td> <td> <p> A model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward Sequence</a>, <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></code> is a valid expression, convertible to <code class="computeroutput"><span class="keyword">bool</span></code>, for every element <code class="computeroutput"><span class="identifier">e</span></code> in <code class="computeroutput"><span class="identifier">seq</span></code> </p> </td> <td> <p> The sequence to search </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">f</span></code> </p> </td> <td> <p> A unary function object </p> </td> <td> <p> The search predicate </p> </td> </tr> </tbody> </table></div> </div> <br class="table-break"><a name="fusion.algorithm.query.functions.none.expression_semantics"></a><h6> <a name="id753168"></a> <a class="link" href="none.html#fusion.algorithm.query.functions.none.expression_semantics">Expression Semantics</a> </h6> <pre class="programlisting"><a class="link" href="none.html" title="none"><code class="computeroutput"><span class="identifier">none</span></code></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span> </pre> <p> <span class="bold"><strong>Return type</strong></span>: <code class="computeroutput"><span class="keyword">bool</span></code> </p> <p> <span class="bold"><strong>Semantics</strong></span>: Returns true if and only if <code class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></code> evaluates to <code class="computeroutput"><span class="keyword">false</span></code> for every element <code class="computeroutput"><span class="identifier">e</span></code> in <code class="computeroutput"><span class="identifier">seq</span></code>. Result equivalent to <code class="computeroutput"><span class="special">!</span><span class="identifier">any</span><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">)</span></code>. </p> <a name="fusion.algorithm.query.functions.none.complexity"></a><h6> <a name="id753309"></a> <a class="link" href="none.html#fusion.algorithm.query.functions.none.complexity">Complexity</a> </h6> <p> Linear. At most <code class="computeroutput"><a class="link" href="../../../sequence/intrinsic/metafunctions/size.html" title="size"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></code></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">>::</span><span class="identifier">value</span></code> comparisons. </p> <a name="fusion.algorithm.query.functions.none.header"></a><h6> <a name="id753360"></a> <a class="link" href="none.html#fusion.algorithm.query.functions.none.header">Header</a> </h6> <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> <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> </pre> <a name="fusion.algorithm.query.functions.none.example"></a><h6> <a name="id756343"></a> <a class="link" href="none.html#fusion.algorithm.query.functions.none.example">Example</a> </h6> <pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">odd</span> <span class="special">{</span> <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">t</span> <span class="special">%</span> <span class="number">2</span><span class="special">;</span> <span class="special">}</span> <span class="special">};</span> <span class="special">...</span> <span class="identifier">assert</span><span class="special">(</span><a class="link" href="none.html" title="none"><code class="computeroutput"><span class="identifier">none</span></code></a><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">2</span><span class="special">,</span><span class="number">4</span><span class="special">),</span> <span class="identifier">odd</span><span class="special">()));</span> <span class="identifier">assert</span><span class="special">(!</span><a class="link" href="none.html" title="none"><code class="computeroutput"><span class="identifier">none</span></code></a><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="identifier">odd</span><span class="special">()));</span> </pre> </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 © 2001-2007 Joel de Guzman, Dan Marsden, Tobias Schwinger<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="all.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.html"><img src="../../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="find.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a> </div> </body> </html>