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| 4 | <title>Chapter 5. Boost.Functional/Hash</title> |
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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="hash"></a>Chapter 5. Boost.Functional/Hash</h2></div> |
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| 29 | <div><div class="author"><h3 class="author"> |
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| 30 | <span class="firstname">Daniel</span> <span class="surname">James</span> |
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| 31 | </h3></div></div> |
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| 32 | <div><p class="copyright">Copyright © 2005 Daniel James</p></div> |
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| 33 | <div><div class="legalnotice"> |
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| 34 | <a name="id2700245"></a><p> |
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| 35 | Distributed under the Boost Software License, Version 1.0. |
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| 36 | (See accompanying file LICENSE_1_0.txt or copy at |
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| 38 | http://www.boost.org/LICENSE_1_0.txt |
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| 39 | </a>) |
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| 41 | </p> |
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| 42 | </div></div> |
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| 43 | </div></div> |
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| 44 | <div class="toc"> |
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| 45 | <p><b>Table of Contents</b></p> |
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| 46 | <dl> |
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| 47 | <dt><span class="section"><a href="hash.html#hash.intro"> Introduction</a></span></dt> |
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| 48 | <dt><span class="section"><a href="hash/tutorial.html"> Tutorial</a></span></dt> |
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| 49 | <dt><span class="section"><a href="hash/custom.html"> Extending boost::hash for a custom data type</a></span></dt> |
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| 50 | <dt><span class="section"><a href="hash/combine.html"> Combining hash values</a></span></dt> |
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| 51 | <dt><span class="section"><a href="hash/portability.html"> Portability</a></span></dt> |
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| 52 | <dt><span class="section"><a href="hash/reference_.html"> Reference</a></span></dt> |
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| 53 | <dt><span class="section"><a href="hash/links.html"> Links</a></span></dt> |
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| 54 | <dt><span class="section"><a href="hash/acknowledgements.html"> Acknowledgements</a></span></dt> |
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| 55 | </dl> |
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| 56 | </div> |
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| 57 | <div class="section" lang="en"> |
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| 58 | <div class="titlepage"><div><div><h3 class="title"> |
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| 59 | <a name="hash.intro"></a> Introduction</h3></div></div></div> |
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| 60 | <p><code class="computeroutput"><a 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 |
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| 61 | specified by the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1745.pdf" target="_top">Technical Report</a>. It is intended for use as the default hash function |
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| 62 | for unordered associative containers, and the <a href="../../libs/multi_index/doc/index.html" target="_top">Boost Multi-Index Containers Library</a>'s hash indexes.</p> |
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| 63 | <p> |
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| 64 | As it is compliant with the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1745.pdf" target="_top">Technical Report</a>, it will work with:</p> |
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| 65 | <div class="itemizedlist"><ul type="disc"> |
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| 66 | <li> |
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| 67 | integers |
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| 68 | </li> |
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| 69 | <li> |
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| 70 | floats |
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| 71 | </li> |
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| 72 | <li> |
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| 73 | pointers |
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| 74 | </li> |
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| 75 | <li> |
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| 76 | strings |
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| 77 | </li> |
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| 78 | </ul></div> |
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| 79 | <p> |
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| 80 | It also implements the extension proposed by Peter Dimov in issue 6.18 of the |
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| 81 | <a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1756.pdf" target="_top">Library Extension Technical Report Issues List</a>, this adds support for:</p> |
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| 82 | <div class="itemizedlist"><ul type="disc"> |
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| 83 | <li> |
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| 84 | arrays |
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| 85 | </li> |
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| 86 | <li><code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span></code></li> |
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| 87 | <li> |
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| 88 | the standard containers. |
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| 89 | </li> |
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| 90 | <li> |
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| 91 | extending <code class="computeroutput"><a href="boost/hash.html" title="Struct template hash">boost::hash</a></code> for custom types. |
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| 92 | </li> |
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| 93 | </ul></div> |
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| 94 | </div> |
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| 95 | </div> |
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| 96 | <table width="100%"><tr> |
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| 97 | <td align="left"><small><p>Last revised: December 03, 2005 at 16:18:04 GMT</p></small></td> |
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| 98 | <td align="right"><small></small></td> |
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