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4<title>Chapter 7. Boost.Functional/Hash</title>
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27<div><h2 class="title">
28<a name="hash"></a>Chapter 7. Boost.Functional/Hash</h2></div>
29<div><div class="author"><h3 class="author">
30<span class="firstname">Daniel</span> <span class="surname">James</span>
31</h3></div></div>
32<div><p class="copyright">Copyright © 2005, 2006 Daniel James</p></div>
33<div><div class="legalnotice">
34<a name="id1216346"></a><p>
35        Distributed under the Boost Software License, Version 1.0. (See accompanying
36        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>
37      </p>
38</div></div>
39</div></div>
40<div class="toc">
41<p><b>Table of Contents</b></p>
42<dl>
43<dt><span class="section"><a href="hash.html#hash.intro"> Introduction</a></span></dt>
44<dt><span class="section"><a href="hash/tutorial.html"> Tutorial</a></span></dt>
45<dt><span class="section"><a href="hash/custom.html"> Extending boost::hash for a custom data type</a></span></dt>
46<dt><span class="section"><a href="hash/combine.html"> Combining hash values</a></span></dt>
47<dt><span class="section"><a href="hash/portability.html"> Portability</a></span></dt>
48<dt><span class="section"><a href="hash/disable.html"> Disabling The Extensions</a></span></dt>
49<dt><span class="section"><a href="hash/changes.html"> Change Log</a></span></dt>
50<dt><span class="section"><a href="hash/reference.html">Reference</a></span></dt>
51<dd><dl>
52<dt><span class="section"><a href="hash/reference.html#hash.reference.specification"></a></span></dt>
53<dt><span class="section"><a href="hash/reference.html#header.boost.functional.hash.hpp">Header &lt;boost/functional/hash.hpp&gt;</a></span></dt>
54</dl></dd>
55<dt><span class="section"><a href="hash/links.html"> Links</a></span></dt>
56<dt><span class="section"><a href="hash/acknowledgements.html"> Acknowledgements</a></span></dt>
57</dl>
58</div>
59<div class="section" lang="en">
60<div class="titlepage"><div><div><h2 class="title" style="clear: both">
61<a name="hash.intro"></a> Introduction</h2></div></div></div>
62<p>
63      <code class="computeroutput"><a href="boost/hash.html" title="Struct template hash">boost::hash</a></code> is an implementation of
64      the <a href="http://en.wikipedia.org/wiki/Hash_function" target="_top">hash function</a>
65      object specified by the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">Draft
66      Technical Report on C++ Library Extensions</a> (TR1). It is intended for
67      use as the default hash function for unordered associative containers, and
68      the <a href="../../libs/multi_index/doc/index.html" target="_top">Boost Multi-Index Containers
69      Library</a>'s hash indexes.
70    </p>
71<p>
72      As it is compliant with <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">TR1</a>,
73      it will work with:
74    </p>
75<div class="itemizedlist"><ul type="disc">
76<li>
77        integers
78      </li>
79<li>
80        floats
81      </li>
82<li>
83        pointers
84      </li>
85<li>
86        strings
87      </li>
88</ul></div>
89<p>
90      It also implements the extension proposed by Peter Dimov in issue 6.18 of the
91      <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1837.pdf" target="_top">Library
92      Extension Technical Report Issues List</a> (page 63), this adds support
93      for:
94    </p>
95<div class="itemizedlist"><ul type="disc">
96<li>
97        arrays
98      </li>
99<li><code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></code></li>
100<li>
101        the standard containers.
102      </li>
103<li>
104        extending <code class="computeroutput"><a href="boost/hash.html" title="Struct template hash">boost::hash</a></code> for custom
105        types.
106      </li>
107</ul></div>
108</div>
109</div>
110<table width="100%"><tr>
111<td align="left"><small><p>Last revised: July 16, 2007 at 17:52:44 GMT</p></small></td>
112<td align="right"><small></small></td>
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