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<div class="title">Adaptors for pointers to functions<div class="ingroups"><a class="el" href="a01477.html">Utilities</a> &raquo; <a class="el" href="a01496.html">Function Objects</a></div></div>  </div>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a07560.html">std::pointer_to_binary_function&lt; _Arg1, _Arg2, _Result &gt;</a></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a07556.html">std::pointer_to_unary_function&lt; _Arg, _Result &gt;</a></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:gaee61fcee12458d9d61b10f07de908134"><td class="memTemplParams" colspan="2">template&lt;typename _Arg , typename _Result &gt; </td></tr>
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<tr class="memitem:ga2c95cd7ca955ae3a4cbf98593456bd8e"><td class="memTemplParams" colspan="2">template&lt;typename _Arg1 , typename _Arg2 , typename _Result &gt; </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>The advantage of function objects over pointers to functions is that the objects in the standard library declare nested typedefs describing their argument and result types with uniform names (e.g., <code>result_type</code> from the base classes <code>unary_function</code> and <code>binary_function</code>). Sometimes those typedefs are required, not just optional.</p>
<p>Adaptors are provided to turn pointers to unary (single-argument) and binary (double-argument) functions into function objects. The long-winded functor <code>pointer_to_unary_function</code> is constructed with a function pointer <code>f</code>, and its <code>operator()</code> called with argument <code>x</code> returns <code>f(x)</code>. The functor <code>pointer_to_binary_function</code> does the same thing, but with a double-argument <code>f</code> and <code>operator()</code>.</p>
<p>The function <code>ptr_fun</code> takes a pointer-to-function <code>f</code> and constructs an instance of the appropriate functor. </p>
<h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#gaee61fcee12458d9d61b10f07de908134">&#9670;&nbsp;</a></span>ptr_fun() <span class="overload">[1/2]</span></h2>

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template&lt;typename _Arg , typename _Result &gt; </div>
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<p>One of the <a class="el" href="a01501.html">adaptors for function pointers</a>. </p>

<p class="definition">Definition at line <a class="el" href="a00542_source.html#l01076">1076</a> of file <a class="el" href="a00542_source.html">stl_function.h</a>.</p>

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<h2 class="memtitle"><span class="permalink"><a href="#ga2c95cd7ca955ae3a4cbf98593456bd8e">&#9670;&nbsp;</a></span>ptr_fun() <span class="overload">[2/2]</span></h2>

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<p>One of the <a class="el" href="a01501.html">adaptors for function pointers</a>. </p>

<p class="definition">Definition at line <a class="el" href="a00542_source.html#l01102">1102</a> of file <a class="el" href="a00542_source.html">stl_function.h</a>.</p>

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