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<h2><span class="refentrytitle">Concept PolymorphicFunctionObject</span></h2>
<p>PolymorphicFunctionObject</p>
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<div class="refsect1">
<a name="id2457328"></a><h2>Description</h2>
<p>
      A type that can be called and that follows the TR1 ResultOf
      protocol for return type calculation.
    </p>
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<div class="refsect1">
<a name="id2457337"></a><h2>Associated types</h2>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem">
<p><span class="bold"><strong>result_type</strong></span></p>
<pre class="literallayout">result_of&lt;Fn(A0,...An)&gt;::type</pre>
<p>
      </p>
<p>The result of calling the Polymorphic Function Object.</p>
<p>
    </p>
</li></ul></div>
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<div class="refsect1">
<a name="id2457362"></a><h2>Notation</h2>
<div class="variablelist"><dl>
<dt><span class="term">Fn</span></dt>
<dd>A type playing the role of polymorphic-function-object-type in the <a class="link" href="PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> concept.</dd>
<dt><span class="term"><code class="varname">fn</code></span></dt>
<dd>Object of type Fn</dd>
<dt><span class="term"><code class="varname">a0,...an</code></span></dt>
<dd>Object of type A0,...An</dd>
</dl></div>
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<div class="refsect1">
<a name="id2457398"></a><h2>Valid expressions</h2>
<div class="informaltable"><table class="table">
<colgroup>
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<thead><tr>
<th>Name</th>
<th>Expression</th>
<th>Type</th>
<th>Semantics</th>
</tr></thead>
<tbody><tr>
<td><p>Function Call</p></td>
<td><p>fn(a0,...an)</p></td>
<td><p><span class="type">result_type</span></p></td>
<td><p>Calls the function object.</p></td>
</tr></tbody>
</table></div>
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<div class="refsect1">
<a name="id2457435"></a><h2>Models</h2>
<div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><span class="simplelist"><span class="type">std::plus&lt;int&gt;</span></span></li></ul></div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<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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