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<div><h2 class="title">
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<a name="hash"></a>Chapter 10. Boost.ContainerHash</h2></div>
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<div><div class="author"><h3 class="author">
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<span class="firstname">Daniel</span> <span class="surname">James</span>
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</h3></div></div>
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<div><p class="copyright">Copyright © 2005-2008 Daniel
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James</p></div>
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<div><div class="legalnotice">
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<a name="hash.legal"></a><p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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<p><b>Table of Contents</b></p>
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<dl class="toc">
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<dt><span class="section"><a href="hash.html#hash.intro">Introduction</a></span></dt>
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<dt><span class="section"><a href="hash/tutorial.html">Tutorial</a></span></dt>
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<dt><span class="section"><a href="hash/custom.html">Extending boost::hash for a custom data type</a></span></dt>
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<dt><span class="section"><a href="hash/combine.html">Combining hash values</a></span></dt>
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<dt><span class="section"><a href="hash/portability.html">Portability</a></span></dt>
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<dt><span class="section"><a href="hash/disable.html">Disabling The Extensions</a></span></dt>
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<dt><span class="section"><a href="hash/changes.html">Change Log</a></span></dt>
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<dt><span class="section"><a href="hash/rationale.html">Rationale</a></span></dt>
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<dt><span class="section"><a href="hash/reference.html">Reference</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="hash/reference.html#hash.reference.specification"></a></span></dt>
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<dt><span class="section"><a href="hash/reference.html#header.boost.container_hash.hash_hpp">Header <boost/container_hash/hash.hpp></a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="hash/links.html">Links</a></span></dt>
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<dt><span class="section"><a href="hash/acknowledgements.html">Acknowledgements</a></span></dt>
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</dl>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="hash.intro"></a><a class="link" href="hash.html#hash.intro" title="Introduction">Introduction</a>
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</h2></div></div></div>
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<p>
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<code class="computeroutput"><a class="link" href="boost/hash.html" title="Struct template hash">boost::hash</a></code> is an implementation of
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the <a href="http://en.wikipedia.org/wiki/Hash_function" target="_top">hash function</a>
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object specified by the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">Draft
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Technical Report on C++ Library Extensions</a> (TR1). It is the default
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hash function for <a class="link" href="unordered.html" title="Chapter 45. Boost.Unordered">Boost.Unordered</a>, <a class="link" href="intrusive/unordered_set_unordered_multiset.html" title="Semi-Intrusive unordered associative containers: unordered_set, unordered_multiset">Boost.Intrusive</a>'s
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unordered associative containers, and <a href="../../libs/multi_index/doc/index.html" target="_top">Boost.MultiIndex</a>'s
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hash indicies and <a href="../../libs/bimap/index.html" target="_top">Boost.Bimap</a>'s
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<code class="computeroutput"><span class="identifier">unordered_set_of</span></code>.
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</p>
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<p>
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As it is compliant with <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">TR1</a>,
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it will work with:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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integers
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</li>
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<li class="listitem">
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floats
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</li>
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<li class="listitem">
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pointers
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</li>
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<li class="listitem">
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strings
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</li>
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</ul></div>
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<p>
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It also implements the extension proposed by Peter Dimov in issue 6.18 of the
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<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1837.pdf" target="_top">Library
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Extension Technical Report Issues List</a> (page 63), this adds support
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for:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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arrays
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</li>
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<li class="listitem">
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<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></code>
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</li>
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<li class="listitem">
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the standard containers.
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</li>
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<li class="listitem">
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extending <code class="computeroutput"><a class="link" href="boost/hash.html" title="Struct template hash">boost::hash</a></code> for custom
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types.
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</li>
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</ul></div>
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<div class="note"><table border="0" summary="Note">
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<tr>
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../doc/src/images/note.png"></td>
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<th align="left">Note</th>
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</tr>
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<tr><td align="left" valign="top"><p>
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This hash function is designed to be used in containers based on the STL
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and is not suitable as a general purpose hash function. For more details
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see the <a class="link" href="hash/rationale.html" title="Rationale">rationale</a>.
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</p></td></tr>
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</table></div>
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</div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"><p><small>Last revised: April 13, 2021 at 16:33:02 GMT</small></p></td>
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