<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Struct template hash</title> <link rel="stylesheet" href="../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="../hash/reference.html#header.boost.functional.hash_hpp" title="Header <boost/functional/hash.hpp>"> <link rel="prev" href="../hash/reference.html" title="Reference"> <link rel="next" href="hash_bool_id583238.html" title="Struct hash<bool>"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td> <td align="center"><a href="../../../index.html">Home</a></td> <td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="../hash/reference.html"><img src="../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../hash/reference.html#header.boost.functional.hash_hpp"><img src="../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="hash_bool_id583238.html"><img src="../../../doc/html/images/next.png" alt="Next"></a> </div> <div class="refentry" title="Struct template hash"> <a name="boost.hash"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Struct template hash</span></h2> <p>boost::hash — A <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">TR1</a> compliant hash function object.</p> </div> <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="emphasis"><em>// In header: <<a class="link" href="../hash/reference.html#header.boost.functional.hash_hpp" title="Header <boost/functional/hash.hpp>">boost/functional/hash.hpp</a>> </em></span><span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> T> <span class="bold"><strong>struct</strong></span> <a class="link" href="hash.html" title="Struct template hash">hash</a> : <span class="bold"><strong>public</strong></span> std::unary_function<T, std::size_t> { <span class="type">std::size_t</span> <a class="link" href="hash.html#id609489-bb"><span class="bold"><strong>operator</strong></span>()</a>(T <span class="bold"><strong>const</strong></span>&) <span class="bold"><strong>const</strong></span>; };</pre></div> <div class="refsect1" title="Description"> <a name="id886677"></a><h2>Description</h2> <pre class="literallayout"><span class="type">std::size_t</span> <a name="id609489-bb"></a><span class="bold"><strong>operator</strong></span>()(T <span class="bold"><strong>const</strong></span>& val) <span class="bold"><strong>const</strong></span>;</pre> <div class="variablelist"><table border="0"> <col align="left" valign="top"> <tbody> <tr> <td><p><span class="term">Returns:</span></p></td> <td> <p> </p> <pre class="programlisting"><a class="link" href="../hash/reference.html#boost.hash_value">hash_value</a>(val)</pre> <p> </p> </td> </tr> <tr> <td><p><span class="term">Notes:</span></p></td> <td> <p> The call to <code class="computeroutput"><a class="link" href="../hash/reference.html#boost.hash_value">hash_value</a></code> is unqualified, so that custom overloads can be found via argument dependent lookup. </p> <p> This is not defined when the macro <code class="computeroutput">BOOST_HASH_NO_EXTENSIONS</code> is defined. The specializations are still defined, so only the specializations required by TR1 are defined. </p> </td> </tr> <tr> <td><p><span class="term">Throws:</span></p></td> <td><p> Only throws if <code class="computeroutput"><a class="link" href="../hash/reference.html#boost.hash_value">hash_value</a>(T)</code> throws. </p></td> </tr> </tbody> </table></div> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2005-2008 Daniel James<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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="../hash/reference.html"><img src="../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../hash/reference.html#header.boost.functional.hash_hpp"><img src="../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="hash_bool_id583238.html"><img src="../../../doc/html/images/next.png" alt="Next"></a> </div> </body> </html>