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| <div><h2 class="title"> |
| <a name="hash"></a>Chapter 8. Boost.Functional/Hash</h2></div> |
| <div><div class="author"><h3 class="author"> |
| <span class="firstname">Daniel</span> <span class="surname">James</span> |
| </h3></div></div> |
| <div><p class="copyright">Copyright © 2005-2008 Daniel |
| James</p></div> |
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| <a name="id1285705"></a><p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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>) |
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| <p><b>Table of Contents</b></p> |
| <dl> |
| <dt><span class="section"><a href="hash.html#hash.intro">Introduction</a></span></dt> |
| <dt><span class="section"><a href="hash/tutorial.html">Tutorial</a></span></dt> |
| <dt><span class="section"><a href="hash/custom.html">Extending boost::hash for a custom data type</a></span></dt> |
| <dt><span class="section"><a href="hash/combine.html">Combining hash values</a></span></dt> |
| <dt><span class="section"><a href="hash/portability.html">Portability</a></span></dt> |
| <dt><span class="section"><a href="hash/disable.html">Disabling The Extensions</a></span></dt> |
| <dt><span class="section"><a href="hash/changes.html">Change Log</a></span></dt> |
| <dt><span class="section"><a href="hash/reference.html">Reference</a></span></dt> |
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| <dt><span class="section"><a href="hash/reference.html#hash.reference.specification"></a></span></dt> |
| <dt><span class="section"><a href="hash/reference.html#header.boost.functional.hash_hpp">Header <boost/functional/hash.hpp></a></span></dt> |
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| <dt><span class="section"><a href="hash/links.html">Links</a></span></dt> |
| <dt><span class="section"><a href="hash/acknowledgements.html">Acknowledgements</a></span></dt> |
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| <div class="section"> |
| <div class="titlepage"><div><div><h2 class="title" style="clear: both"> |
| <a name="hash.intro"></a><a class="link" href="hash.html#hash.intro" title="Introduction">Introduction</a> |
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| <p> |
| <code class="computeroutput"><a class="link" href="boost/hash.html" title="Struct template hash">boost::hash</a></code> is an implementation of |
| the <a href="http://en.wikipedia.org/wiki/Hash_function" target="_top">hash function</a> |
| object specified by the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">Draft |
| Technical Report on C++ Library Extensions</a> (TR1). It is the default |
| hash function for <a class="link" href="unordered.html" title="Chapter 27. 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 |
| unordered associative containers, and <a href="../../libs/multi_index/doc/index.html" target="_top">Boost.MultiIndex</a>'s |
| hash indicies and <a href="../../libs/bimap/index.html" target="_top">Boost.Bimap</a>'s |
| <code class="computeroutput"><span class="identifier">unordered_set_of</span></code>. |
| </p> |
| <p> |
| As it is compliant with <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">TR1</a>, |
| it will work with: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| integers |
| </li> |
| <li class="listitem"> |
| floats |
| </li> |
| <li class="listitem"> |
| pointers |
| </li> |
| <li class="listitem"> |
| strings |
| </li> |
| </ul></div> |
| <p> |
| It also implements the extension proposed by Peter Dimov in issue 6.18 of the |
| <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1837.pdf" target="_top">Library |
| Extension Technical Report Issues List</a> (page 63), this adds support |
| for: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" type="disc"> |
| <li class="listitem"> |
| arrays |
| </li> |
| <li class="listitem"> |
| <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></code> |
| </li> |
| <li class="listitem"> |
| the standard containers. |
| </li> |
| <li class="listitem"> |
| extending <code class="computeroutput"><a class="link" href="boost/hash.html" title="Struct template hash">boost::hash</a></code> for custom |
| types. |
| </li> |
| </ul></div> |
| </div> |
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| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"><p><small>Last revised: November 10, 2010 at 00:44:25 GMT</small></p></td> |
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