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| 26 | <div class="titlepage"><div> |
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| 27 | <div><h2 class="title"> |
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| 28 | <a name="function"></a>Chapter 4. Boost.Function</h2></div> |
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| 29 | <div><div class="author"> |
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| 30 | <h3 class="author"> |
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| 31 | <span class="firstname">Douglas</span> <span class="surname">Gregor</span> |
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| 32 | </h3> |
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| 33 | <code class="email"><<a href="mailto:dgregor%20-at-%20cs.indiana.edu">dgregor -at- cs.indiana.edu</a>></code> |
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| 34 | </div></div> |
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| 35 | <div><p class="copyright">Copyright © 2001-2004 Douglas Gregor</p></div> |
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| 37 | <a name="id2687816"></a><p>Use, modification and distribution is subject to the Boost |
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| 38 | Software License, Version 1.0. (See accompanying file |
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| 39 | <code class="filename">LICENSE_1_0.txt</code> 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> |
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| 40 | </div></div> |
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| 41 | </div></div> |
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| 42 | <div class="toc"> |
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| 43 | <p><b>Table of Contents</b></p> |
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| 44 | <dl> |
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| 45 | <dt><span class="section"><a href="function.html#function.intro">Introduction</a></span></dt> |
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| 46 | <dt><span class="section"><a href="function/history.html">History & Compatibility Notes</a></span></dt> |
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| 47 | <dt><span class="section"><a href="function/tutorial.html">Tutorial</a></span></dt> |
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| 48 | <dd><dl> |
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| 49 | <dt><span class="section"><a href="function/tutorial.html#id2688219">Basic Usage</a></span></dt> |
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| 50 | <dt><span class="section"><a href="function/tutorial.html#id2688524">Free functions</a></span></dt> |
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| 51 | <dt><span class="section"><a href="function/tutorial.html#id2688553">Member functions</a></span></dt> |
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| 52 | <dt><span class="section"><a href="function/tutorial.html#id2688714">References to Function Objects</a></span></dt> |
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| 53 | <dt><span class="section"><a href="function/tutorial.html#id2688865">Comparing Boost.Function function objects</a></span></dt> |
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| 54 | </dl></dd> |
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| 55 | <dt><span class="section"><a href="function/reference.html">Reference</a></span></dt> |
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| 56 | <dd><dl> |
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| 57 | <dt><span class="section"><a href="function/reference.html#function.definitions">Definitions</a></span></dt> |
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| 58 | <dt><span class="section"><a href="function/reference.html#header.boost.function.hpp">Header <boost/function.hpp></a></span></dt> |
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| 59 | <dt><span class="section"><a href="function/reference.html#id2358074">Header <boost/function_equal.hpp></a></span></dt> |
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| 60 | </dl></dd> |
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| 61 | <dt><span class="section"><a href="function/faq.html">Frequently Asked Questions</a></span></dt> |
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| 62 | <dt><span class="section"><a href="function/misc.html">Miscellaneous Notes</a></span></dt> |
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| 63 | <dd><dl> |
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| 64 | <dt><span class="section"><a href="function/misc.html#id2699572">Boost.Function vs. Function Pointers</a></span></dt> |
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| 65 | <dt><span class="section"><a href="function/misc.html#id2699622">Performance</a></span></dt> |
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| 66 | <dt><span class="section"><a href="function/misc.html#id2699664">Combatting virtual function "bloat"</a></span></dt> |
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| 67 | <dt><span class="section"><a href="function/misc.html#id2699713">Acknowledgements</a></span></dt> |
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| 68 | </dl></dd> |
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| 69 | <dt><span class="section"><a href="function/testsuite.html">Testsuite</a></span></dt> |
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| 70 | <dd><dl> |
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| 71 | <dt><span class="section"><a href="function/testsuite.html#function.testsuite.acceptance">Acceptance tests</a></span></dt> |
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| 72 | <dt><span class="section"><a href="function/testsuite.html#function.testsuite.negative">Negative tests</a></span></dt> |
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| 73 | </dl></dd> |
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| 74 | </dl> |
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| 75 | </div> |
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| 76 | <div class="section" lang="en"> |
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| 77 | <div class="titlepage"><div><div><h3 class="title"> |
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| 78 | <a name="function.intro"></a>Introduction</h3></div></div></div> |
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| 79 | <p>The Boost.Function library contains a family of class templates |
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| 80 | that are function object wrappers. The notion is similar to a |
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| 81 | generalized callback. It shares features with function pointers in |
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| 82 | that both define a call interface (e.g., a function taking two integer |
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| 83 | arguments and returning a floating-point value) through which some |
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| 84 | implementation can be called, and the implementation that is invoked |
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| 85 | may change throughout the course of the program.</p> |
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| 86 | <p> Generally, any place in which a function pointer would be used |
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| 87 | to defer a call or make a callback, Boost.Function can be used instead |
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| 88 | to allow the user greater flexibility in the implementation of the |
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| 89 | target. Targets can be any 'compatible' function object (or function |
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| 90 | pointer), meaning that the arguments to the interface designated by |
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| 91 | Boost.Function can be converted to the arguments of the target |
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| 92 | function object.</p> |
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| 93 | </div> |
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| 94 | </div> |
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| 95 | <table width="100%"><tr> |
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| 96 | <td align="left"><small><p>Last revised: July 25, 2004 at 02:51:51 GMT</p></small></td> |
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| 97 | <td align="right"><small></small></td> |
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| 98 | </tr></table> |
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