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<link rel="start" href="../../../../index.html" title="Chapter 1. Fusion 2.0">
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h5 class="title">
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<a name="fusion.algorithm.query.functions.none"></a><a href="none.html" title="none">none</a></h5></div></div></div>
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<a name="fusion.algorithm.query.functions.none.description"></a><h6>
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<a name="id590974"></a>
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<a href="none.html#fusion.algorithm.query.functions.none.description">Description</a>
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</h6>
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<p>
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For a sequence <tt class="computeroutput"><span class="identifier">seq</span></tt> and
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unary function object <tt class="computeroutput"><span class="identifier">f</span></tt>,
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<tt class="computeroutput"><span class="identifier">none</span></tt> returns true if
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<tt class="computeroutput"><span class="identifier">f</span></tt> returns false for every
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element of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
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</p>
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<a name="fusion.algorithm.query.functions.none.synopsis"></a><h6>
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<a name="id591052"></a>
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<a href="none.html#fusion.algorithm.query.functions.none.synopsis">Synopsis</a>
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</h6>
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<pre class="programlisting">
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<span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">F</span>
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<span class="special">></span>
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<span class="keyword">typename</span> <a href="../metafunctions/none.html" title="none"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">none</span></tt></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>
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<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>
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</pre>
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<div class="table">
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<a name="id591225"></a><p class="title"><b>Table 1.41. Parameters</b></p>
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<table class="table" summary="Parameters">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Parameter
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</p>
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</th>
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<th>
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<p>
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Requirement
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</p>
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</th>
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<th>
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<p>
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Description
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">seq</span></tt>
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</p>
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</td>
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<td>
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<p>
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A model of <a href="../../../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>, <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> is a valid expression, convertible
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to <tt class="computeroutput"><span class="keyword">bool</span></tt>, for every
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element <tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
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</p>
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</td>
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<td>
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<p>
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The sequence to search
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">f</span></tt>
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</p>
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</td>
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<td>
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<p>
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A unary function object
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</p>
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</td>
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<td>
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<p>
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The search predicate
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</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<a name="fusion.algorithm.query.functions.none.expression_semantics"></a><h6>
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<a name="id591413"></a>
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<a href="none.html#fusion.algorithm.query.functions.none.expression_semantics">Expression
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Semantics</a>
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</h6>
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<pre class="programlisting">
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<a href="none.html" title="none"><tt class="computeroutput"><span class="identifier">none</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
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</pre>
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<p>
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<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
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</p>
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<p>
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<span class="bold"><b>Semantics</b></span>: Returns true if and only
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if <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt>
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evaluates to <tt class="computeroutput"><span class="keyword">false</span></tt> for every
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element <tt class="computeroutput"><span class="identifier">e</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>. Result equivalent to <tt 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></tt>.
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</p>
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<a name="fusion.algorithm.query.functions.none.complexity"></a><h6>
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<a name="id591603"></a>
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<a href="none.html#fusion.algorithm.query.functions.none.complexity">Complexity</a>
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</h6>
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<p>
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Linear. At most <tt class="computeroutput"><a href="../../../sequence/intrinsic/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">>::</span><span class="identifier">value</span></tt> comparisons.
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</p>
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<a name="fusion.algorithm.query.functions.none.header"></a><h6>
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<a name="id591677"></a>
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<a href="none.html#fusion.algorithm.query.functions.none.header">Header</a>
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</h6>
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<pre class="programlisting">
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<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>
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<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>
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</pre>
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<a name="fusion.algorithm.query.functions.none.example"></a><h6>
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<a name="id591828"></a>
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<a href="none.html#fusion.algorithm.query.functions.none.example">Example</a>
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</h6>
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<pre class="programlisting">
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<span class="keyword">struct</span> <span class="identifier">odd</span>
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<span class="special">{</span>
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<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span>
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<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>
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<span class="special">{</span>
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<span class="keyword">return</span> <span class="identifier">t</span> <span class="special">%</span> <span class="number">2</span><span class="special">;</span>
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<span class="special">}</span>
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<span class="special">};</span>
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<span class="special">...</span>
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<span class="identifier">assert</span><span class="special">(</span><a href="none.html" title="none"><tt class="computeroutput"><span class="identifier">none</span></tt></a><span class="special">(</span><a href="../../../container/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></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>
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<span class="identifier">assert</span><span class="special">(!</span><a href="none.html" title="none"><tt class="computeroutput"><span class="identifier">none</span></tt></a><span class="special">(</span><a href="../../../container/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></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>
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</pre>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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</p>
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</div></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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