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boost_fusion/doc/html/fusion/functional/invocation/functions/invoke_fobj.html
Christopher Schmidt 35e469e2d5 fix for #2355: discrepancy between std::accumulate and fusion::accumulate 
[SVN r57125]
2009-10-24 10:59:01 +00:00

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<div class="section" title="invoke_function_object">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.functional.invocation.functions.invoke_fobj"></a><a class="link" href="invoke_fobj.html" title="invoke_function_object">
invoke_function_object</a>
</h5></div></div></div>
<a name="fusion.functional.invocation.functions.invoke_fobj.description"></a><h6>
<a name="id865819"></a>
<a class="link" href="invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.description">Description</a>
</h6>
<p>
Calls a <a class="link" href="../../concepts/poly.html" title="Polymorphic Function Object">Polymorphic Function
Object</a> with the arguments from a <a class="link" href="../../../sequence.html" title="Sequence">Sequence</a>.
</p>
<p>
The first template parameter can be specialized explicitly to avoid copying
and/or to control the const qualification of a function object.
</p>
<p>
Constructors can be called applying <a href="http://www.boost.org/libs/functional/factory/doc/html/index.html" target="_top">Boost.Functional/Factory</a>.
</p>
<a name="fusion.functional.invocation.functions.invoke_fobj.synopsis"></a><h6>
<a name="id865862"></a>
<a class="link" href="invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.synopsis">Synopsis</a>
</h6>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Function</span><span class="special">,</span>
<span class="keyword">class</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a class="link" href="../metafunctions/invoke_fobj.html" title="invoke_function_object"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">invoke_function_object</span></code></a><span class="special">&lt;</span><span class="identifier">Function</span><span class="special">,</span> <span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">invoke_function_object</span><span class="special">(</span><span class="identifier">Function</span> <span class="identifier">f</span><span class="special">,</span> <span class="identifier">Sequence</span> <span class="special">&amp;</span> <span class="identifier">s</span><span class="special">);</span>
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">Function</span><span class="special">,</span>
<span class="keyword">class</span> <span class="identifier">Sequence</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a class="link" href="../metafunctions/invoke_fobj.html" title="invoke_function_object"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">invoke_function_object</span></code></a><span class="special">&lt;</span><span class="identifier">Function</span><span class="special">,</span> <span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">invoke_function_object</span><span class="special">(</span><span class="identifier">Function</span> <span class="identifier">f</span><span class="special">,</span> <span class="identifier">Sequence</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">s</span><span class="special">);</span>
</pre>
<a name="fusion.functional.invocation.functions.invoke_fobj.parameters"></a><h6>
<a name="id866131"></a>
<a class="link" href="invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<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">f</span></code>
</p>
</td>
<td>
<p>
Model of <a class="link" href="../../concepts/poly.html" title="Polymorphic Function Object">Polymorphic
Function Object</a>
</p>
</td>
<td>
<p>
The function object to call.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">s</span></code>
</p>
</td>
<td>
<p>
Model of <a class="link" href="../../../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
The arguments.
</p>
</td>
</tr>
</tbody>
</table></div>
<a name="fusion.functional.invocation.functions.invoke_fobj.expression_semantics"></a><h6>
<a name="id866256"></a>
<a class="link" href="invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting"><span class="identifier">invoke_function_object</span><span class="special">(</span><span class="identifier">f</span><span class="special">,</span><span class="identifier">s</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Return type</strong></span>: Return type of <code class="computeroutput"><span class="identifier">f</span></code> when invoked with the elements in
<code class="computeroutput"><span class="identifier">s</span></code> as its arguments.
</p>
<p>
<span class="bold"><strong>Semantics</strong></span>: Invokes <code class="computeroutput"><span class="identifier">f</span></code>
with the elements in <code class="computeroutput"><span class="identifier">s</span></code>
as arguments and returns the result of the call expression.
</p>
<a name="fusion.functional.invocation.functions.invoke_fobj.header"></a><h6>
<a name="id866343"></a>
<a class="link" href="invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.header">Header</a>
</h6>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">functional</span><span class="special">/</span><span class="identifier">invocation</span><span class="special">/</span><span class="identifier">invoke_function_object</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.functional.invocation.functions.invoke_fobj.example"></a><h6>
<a name="id866418"></a>
<a class="link" href="invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.example">Example</a>
</h6>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">sub</span>
<span class="special">{</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Sig</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">result</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Self</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">result</span><span class="special">&lt;</span> <span class="identifier">Self</span><span class="special">(</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">T</span><span class="special">)</span> <span class="special">&gt;</span>
<span class="special">{</span> <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">type</span><span class="special">;</span> <span class="special">};</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">T</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="identifier">T</span> <span class="identifier">rhs</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">lhs</span> <span class="special">-</span> <span class="identifier">rhs</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="keyword">void</span> <span class="identifier">try_it</span><span class="special">()</span>
<span class="special">{</span>
<span class="identifier">sub</span> <span class="identifier">f</span><span class="special">;</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">f</span><span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="number">1</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">invoke_function_object</span><span class="special">(</span><span class="identifier">f</span><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">1</span><span class="special">)));</span>
<span class="special">}</span>
</pre>
<a name="fusion.functional.invocation.functions.invoke_fobj.see_also"></a><h6>
<a name="id866824"></a>
<a class="link" href="invoke_fobj.html#fusion.functional.invocation.functions.invoke_fobj.see_also">See
also</a>
</h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><a class="link" href="invoke.html" title="invoke"><code class="computeroutput"><span class="identifier">invoke</span></code></a></li>
<li class="listitem"><a class="link" href="invoke_proc.html" title="invoke_procedure"><code class="computeroutput"><span class="identifier">invoke_procedure</span></code></a></li>
<li class="listitem"><a class="link" href="../metafunctions/invoke_fobj.html" title="invoke_function_object"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">invoke_function_object</span></code></a></li>
<li class="listitem"><a class="link" href="../../adapters/fused_function_object.html" title="fused_function_object"><code class="computeroutput"><span class="identifier">fused_function_object</span></code></a></li>
<li class="listitem"><a class="link" href="../../generation/functions/mk_fused_fobj.html" title="make_fused_function_object"><code class="computeroutput"><span class="identifier">make_fused_function_object</span></code></a></li>
</ul></div>
</div>
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<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>)
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