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boost_fusion/doc/html/fusion/functional/invocation/functions/invoke.html
Christopher Schmidt cd811f56bc Fusion: merge from trunk 
[SVN r67492]
2010-12-29 19:54:59 +00:00

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<title>invoke</title>
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<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.functional.invocation.functions.invoke"></a><a class="link" href="invoke.html" title="invoke">invoke</a>
</h5></div></div></div>
<a name="fusion.functional.invocation.functions.invoke.description"></a><h6>
<a name="id1036181"></a>
<a class="link" href="invoke.html#fusion.functional.invocation.functions.invoke.description">Description</a>
</h6>
<p>
Calls a <a class="link" href="../../concepts/def_callable.html" title="Deferred Callable Object">Deferred
Callable 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>
If the target function is a pointer to a class members, the corresponding
object can be specified as a reference, pointer, or smart pointer. In
case of the latter, a freestanding <code class="literal">get_pointer</code> function
must be defined (Boost provides this function for <code class="literal">std::auto_ptr</code>
and <a href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span></code></a>).
</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.synopsis"></a><h6>
<a name="id1036252"></a>
<a class="link" href="invoke.html#fusion.functional.invocation.functions.invoke.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.html" title="invoke"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">invoke</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</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.html" title="invoke"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">invoke</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</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.parameters"></a><h6>
<a name="id1036518"></a>
<a class="link" href="invoke.html#fusion.functional.invocation.functions.invoke.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>
A <a class="link" href="../../concepts/def_callable.html" title="Deferred Callable Object">Deferred
Callable Object</a>
</p>
</td>
<td>
<p>
The function to call.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">s</span></code>
</p>
</td>
<td>
<p>
A <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.expression_semantics"></a><h6>
<a name="id1036651"></a>
<a class="link" href="invoke.html#fusion.functional.invocation.functions.invoke.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting"><span class="identifier">invoke</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.header"></a><h6>
<a name="id1036736"></a>
<a class="link" href="invoke.html#fusion.functional.invocation.functions.invoke.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</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.functional.invocation.functions.invoke.example"></a><h6>
<a name="id1036806"></a>
<a class="link" href="invoke.html#fusion.functional.invocation.functions.invoke.example">Example</a>
</h6>
<pre class="programlisting"><a href="http://www.sgi.com/tech/stl/plus.html" target="_top"><code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">plus</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">add</span><span class="special">;</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">invoke</span><span class="special">(</span><span class="identifier">add</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">1</span><span class="special">,</span><span class="number">1</span><span class="special">))</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span>
</pre>
<a name="fusion.functional.invocation.functions.invoke.see_also"></a><h6>
<a name="id1036921"></a>
<a class="link" href="invoke.html#fusion.functional.invocation.functions.invoke.see_also">See
also</a>
</h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<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="invoke_fobj.html" title="invoke_function_object"><code class="computeroutput"><span class="identifier">invoke_function_object</span></code></a>
</li>
<li class="listitem">
<a class="link" href="../metafunctions/invoke.html" title="invoke"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">invoke</span></code></a>
</li>
<li class="listitem">
<a class="link" href="../../adapters/fused.html" title="fused"><code class="computeroutput"><span class="identifier">fused</span></code></a>
</li>
<li class="listitem">
<a class="link" href="../../generation/functions/mk_fused.html" title="make_fused"><code class="computeroutput"><span class="identifier">make_fused</span></code></a>
</li>
</ul></div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 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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