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  73.           BoostBook element rationale"><link rel="refentry" href="Assignable.html" title="Concept Assignable"><link rel="refentry" href="InputIterator.html" title="Concept InputIterator"><link rel="refentry" href="OutputIterator.html" title="Concept OutputIterator"><link rel="refentry" href="ForwardIterator.html" title="Concept ForwardIterator"><link rel="refentry" href="BidirectionalIterator.html" title="Concept BidirectionalIterator"><link rel="refentry" href="RandomAccessIterator.html" title="Concept RandomAccessIterator"><link rel="refentry" href="DefaultConstructible.html" title="Concept DefaultConstructible"><link rel="refentry" href="CopyConstructible.html" title="Concept CopyConstructible"><link rel="refentry" href="EqualityComparable.html" title="Concept EqualityComparable"><link rel="refentry" href="LessThanComparable.html" title="Concept LessThanComparable"><link rel="refentry" href="SignedInteger.html" title="Concept SignedInteger"><link rel="section" href="function.html#function.intro" title="Introduction"><link rel="section" href="function.history.html" title="History &amp; Compatibility Notes"><link rel="section" href="function.tutorial.html" title="Tutorial"><link rel="section" href="function.reference.html" title="Reference"><link rel="section" href="function.faq.html" title="Frequently Asked Questions"><link rel="section" href="function.misc.html" title="Miscellaneous Notes"><link rel="section" href="function.testsuite.html" title="Testsuite"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" border="1" cellpadding="2" bgcolor="#007F7F"><tr><td bgcolor="#FFFFFF"><img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" width="277" height="86"></td><td><a href="../../index.htm"><font color="#FFFFFF" size="4" face="Arial">Home</font></a></td><td><a href="libraries.html"><font color="#FFFFFF" size="4" face="Arial">Libraries</font></a></td><td><a href="../../people/people.htm"><font color="#FFFFFF" size="4" face="Arial">People</font></a></td><td><a href="../../more/faq.htm"><font color="#FFFFFF" size="4" face="Arial">FAQ</font></a></td><td><a href="../../more/index.htm"><font color="#FFFFFF" size="4" face="Arial">More</font></a></td></tr></table><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="function"></a>Boost.Function</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Douglas</span> <span class="surname">Gregor</span></h3></div></div><div><p class="copyright">Copyright © 2001-2003 Douglas Gregor</p></div><div><div class="legalnotice"><p>Use, modification and distribution is subject to the Boost
    74. 

  74.     Software License, Version 1.0. (See accompanying file
    75. 

  75.     <tt class="filename">LICENSE_1_0.txt</tt> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</p></div></div></div><div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><a href="function.html#function.intro">Introduction</a></dt><dt><a href="function.history.html">History &amp; Compatibility Notes</a></dt><dt><a href="function.tutorial.html">Tutorial</a></dt><dd><dl><dt><a href="function.tutorial.html#id2511232">Basic Usage</a></dt><dt><a href="function.tutorial.html#id2511507">Free functions</a></dt><dt><a href="function.tutorial.html#id2511537">Member functions</a></dt><dt><a href="function.tutorial.html#id2511686">References to Functions</a></dt></dl></dd><dt><a href="function.reference.html">Reference</a></dt><dd><dl><dt><a href="function.reference.html#function.definitions">Definitions</a></dt><dt><a href="function.reference.html#header.boost.function.hpp">Header &lt;boost/function.hpp&gt;</a></dt></dl></dd><dt><a href="function.faq.html">Frequently Asked Questions</a></dt><dt><a href="function.misc.html">Miscellaneous Notes</a></dt><dd><dl><dt><a href="function.misc.html#id2517501">Boost.Function vs. Function Pointers</a></dt><dt><a href="function.misc.html#id2517552">Performance</a></dt><dt><a href="function.misc.html#id2517594">Combatting virtual function "bloat"</a></dt><dt><a href="function.misc.html#id2517628">Acknowledgements</a></dt></dl></dd><dt><a href="function.testsuite.html">Testsuite</a></dt><dd><dl><dt><a href="function.testsuite.html#function.testsuite.acceptance">Acceptance tests</a></dt><dt><a href="function.testsuite.html#function.testsuite.negative">Negative tests</a></dt></dl></dd></dl></div><div class="section" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="function.intro"></a>Introduction</h3></div></div><div></div></div><p>The Boost.Function library contains a family of class templates
    76. 

  76. that are function object wrappers. The notion is similar to a
    77. 

  77. generalized callback. It shares features with function pointers in
    78. 

  78. that both define a call interface (e.g., a function taking two integer
    79. 

  79. arguments and returning a floating-point value) through which some
    80. 

  80. implementation can be called, and the implementation that is invoked
    81. 

  81. may change throughout the course of the program.</p><p> Generally, any place in which a function pointer would be used
    82. 

  82. to defer a call or make a callback, Boost.Function can be used instead
    83. 

  83. to allow the user greater flexibility in the implementation of the
    84. 

  84. target. Targets can be any 'compatible' function object (or function
    85. 

  85. pointer), meaning that the arguments to the interface designated by
    86. 

  86. Boost.Function can be converted to the arguments of the target
    87. 

  87. function object.</p></div></div><table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr><td align="left"><small>Last revised: October 01, 2003 at 04:10:37 GMT</small></td><td align="right"><small></small></td></tr></table><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="array.ack.html"><img src="images/prev.png" alt="Prev"></a> </td><td width="20%" align="center"><a accesskey="u" href="index.html"><img src="images/up.png" alt="Up"></a></td><td width="40%" align="right"> <a accesskey="n" href="function.history.html"><img src="images/next.png" alt="Next"></a></td></tr><tr><td width="40%" align="left" valign="top">Acknowledgements </td><td width="20%" align="center"><a accesskey="h" href="index.html"><img src="images/home.png" alt="Home"></a></td><td width="40%" align="right" valign="top"> History &amp; Compatibility Notes</td></tr></table></div></body></html>
    88.
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