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<a name="hash.reference"></a>Reference</h2></div></div></div>
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<dt><span class="section"><a href="reference.html#hash.reference.specification"></a></span></dt>
<dt><span class="section"><a href="reference.html#header.boost.functional.hash_hpp">Header <boost/functional/hash.hpp></a></span></dt>
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<p>For the full specification, see section 6.3 of the
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">C++ Standard Library Technical Report</a>
and 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).
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<div class="titlepage"><div><div><h3 class="title">
<a name="header.boost.functional.hash_hpp"></a>Header <<a href="../../../boost/functional/hash.hpp" target="_top">boost/functional/hash.hpp</a>></h3></div></div></div>
<p>
Defines <code class="computeroutput"><a class="link" href="../boost/hash.html" title="Struct template hash">boost::hash</a></code>,
and helper functions.
</p>
<pre class="synopsis"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash.html" title="Struct template hash">hash</a><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_bool_idp528061728.html" title="Struct hash<bool>">hash</a><span class="special"><</span><span class="keyword">bool</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_char_idp528068496.html" title="Struct hash<char>">hash</a><span class="special"><</span><span class="keyword">char</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_signed_c_idp528075264.html" title="Struct hash<signed char>">hash</a><span class="special"><</span><span class="keyword">signed</span> <span class="keyword">char</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_unsigned_idp528082032.html" title="Struct hash<unsigned char>">hash</a><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_wchar_t_idp528088800.html" title="Struct hash<wchar_t>">hash</a><span class="special"><</span><span class="keyword">wchar_t</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_char16_t_idp528095568.html" title="Struct hash<char16_t>">hash</a><span class="special"><</span><span class="keyword">char16_t</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_char32_t_idp528102336.html" title="Struct hash<char32_t>">hash</a><span class="special"><</span><span class="keyword">char32_t</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_short_idp528109104.html" title="Struct hash<short>">hash</a><span class="special"><</span><span class="keyword">short</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_unsigned_idp528115872.html" title="Struct hash<unsigned short>">hash</a><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">short</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_int_idp528122640.html" title="Struct hash<int>">hash</a><span class="special"><</span><span class="keyword">int</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_unsigned_idp528129408.html" title="Struct hash<unsigned int>">hash</a><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_long_idp528136176.html" title="Struct hash<long>">hash</a><span class="special"><</span><span class="keyword">long</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_unsigned_idp528142944.html" title="Struct hash<unsigned long>">hash</a><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">long</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_long_lon_idp528149712.html" title="Struct hash<long long>">hash</a><span class="special"><</span><span class="keyword">long</span> <span class="keyword">long</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_unsigned_idp528156480.html" title="Struct hash<unsigned long long>">hash</a><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">long</span> <span class="keyword">long</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_float_idp528163248.html" title="Struct hash<float>">hash</a><span class="special"><</span><span class="keyword">float</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_double_idp528170016.html" title="Struct hash<double>">hash</a><span class="special"><</span><span class="keyword">double</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_long_dou_idp528176784.html" title="Struct hash<long double>">hash</a><span class="special"><</span><span class="keyword">long</span> <span class="keyword">double</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_std_stri_idp528183552.html" title="Struct hash<std::string>">hash</a><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_std_wstr_idp528190320.html" title="Struct hash<std::wstring>">hash</a><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_std_u16s_idp528197088.html" title="Struct hash<std::u16string>">hash</a><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">u16string</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_std_u32s_idp528203856.html" title="Struct hash<std::u32string>">hash</a><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">u32string</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_T_idp528210624.html" title="Struct template hash<T*>">hash</a><span class="special"><</span><span class="identifier">T</span><span class="special">*</span><span class="special">></span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="special">></span> <span class="keyword">struct</span> <a class="link" href="../boost/hash_std_type_idp528217376.html" title="Struct hash<std::type_index>">hash</a><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_index</span><span class="special">></span><span class="special">;</span>
<span class="comment">// <a class="link" href="reference.html#idp528224480-bb">Support functions (Boost extension).</a></span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">void</span> <a class="link" href="reference.html#boost.hash_combine"><span class="identifier">hash_combine</span></a><span class="special">(</span><span class="identifier">size_t</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528238640-bb"><span class="identifier">hash_range</span></a><span class="special">(</span><span class="identifier">It</span><span class="special">,</span> <span class="identifier">It</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <span class="keyword">void</span> <a class="link" href="reference.html#idp528242240-bb"><span class="identifier">hash_range</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&</span><span class="special">,</span> <span class="identifier">It</span><span class="special">,</span> <span class="identifier">It</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="reference.html#idp528257088-bb">Overloadable hash implementation (Boost extension).</a></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528259216-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">bool</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528260960-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">char</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528262704-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">signed</span> <span class="keyword">char</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528264448-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528266192-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">wchar_t</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528267936-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">char16_t</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528269680-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">char32_t</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528271424-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">short</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528273168-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">short</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528274912-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">int</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528276656-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528278400-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">long</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528280144-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">long</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528281888-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">long</span> <span class="keyword">long</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528283632-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">long</span> <span class="keyword">long</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528285376-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">float</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528287120-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">double</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528288864-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">long</span> <span class="keyword">double</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528290608-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">T</span><span class="special">*</span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">unsigned</span> N<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528293040-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">T</span> <span class="special">(</span><span class="special">&</span><span class="identifier">val</span><span class="special">)</span><span class="special">[</span><span class="identifier">N</span><span class="special">]</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">unsigned</span> N<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528296368-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">(</span><span class="special">&</span><span class="identifier">val</span><span class="special">)</span><span class="special">[</span><span class="identifier">N</span><span class="special">]</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Ch<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528299696-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">Ch</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special"><</span><span class="identifier">Ch</span><span class="special">></span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">,</span> <span class="keyword">typename</span> B<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528303360-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special"><</span><span class="identifier">A</span><span class="special">,</span> <span class="identifier">B</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528306672-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528310000-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">list</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528313312-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">deque</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> K<span class="special">,</span> <span class="keyword">typename</span> C<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528316624-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">set</span><span class="special"><</span><span class="identifier">K</span><span class="special">,</span> <span class="identifier">C</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> K<span class="special">,</span> <span class="keyword">typename</span> C<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528320512-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">multiset</span><span class="special"><</span><span class="identifier">K</span><span class="special">,</span> <span class="identifier">C</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> K<span class="special">,</span> <span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> C<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528324400-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special"><</span><span class="identifier">K</span><span class="special">,</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">C</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> K<span class="special">,</span> <span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> C<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528328848-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">multimap</span><span class="special"><</span><span class="identifier">K</span><span class="special">,</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">C</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528333296-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">complex</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528336048-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_index</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> N<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528337792-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">array</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">N</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> T<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="reference.html#idp528341712-bb"><span class="identifier">hash_value</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">tuple</span><span class="special"><</span><span class="identifier">T</span><span class="special">...</span><span class="special">></span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span></pre>
<div class="refsect2">
<a name="idp227429616"></a><h3>
<a name="idp528224480-bb"></a><code class="computeroutput"></code> Support functions (Boost extension).</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="keyword">void</span> <a name="boost.hash_combine"></a><span class="identifier">hash_combine</span><span class="special">(</span><span class="identifier">size_t</span> <span class="special">&</span> seed<span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> v<span class="special">)</span><span class="special">;</span></pre>
<p class="simpara">
Called repeatedly to incrementally create a hash value from
several variables.
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td>
Updates <code class="computeroutput">seed</code> with a new hash value generated by
combining it with the result of
<code class="computeroutput"><a class="link" href="reference.html#boost.hash_value_idp528258032">hash_value</a>(v)</code>. Will
always produce the same result for the same combination of
<code class="computeroutput">seed</code> and
<code class="computeroutput"><a class="link" href="reference.html#boost.hash_value_idp528258032">hash_value</a>(v)</code> during
the single run of a program.
</td>
</tr>
<tr>
<td><p><span class="term">Notes:</span></p></td>
<td>
<p><a class="link" href="reference.html#boost.hash_value_idp528258032">hash_value</a> is called without
qualification, so that overloads can be found via ADL.</p>
<p>This is an extension to TR1</p>
<p>
Forward declared in
<code class="computeroutput"><boost/functional/hash_fwd.hpp></code>
</p>
<p>
This hash function is not intended for general use, and isn't
guaranteed to be equal during separate runs of a program - so
please don't use it for any persistent storage or communication.
</p>
</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>
Only throws if <a class="link" href="reference.html#boost.hash_value_idp528258032">hash_value</a>(T) throws.
Strong exception safety, as long as <a class="link" href="reference.html#boost.hash_value_idp528258032">hash_value</a>(T)
also has strong exception safety.
</td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<p><a name="boost.hash_range_idp528238080"></a></p>
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528238640-bb"></a><span class="identifier">hash_range</span><span class="special">(</span><span class="identifier">It</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> It<span class="special">></span> <span class="keyword">void</span> <a name="idp528242240-bb"></a><span class="identifier">hash_range</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&</span> seed<span class="special">,</span> <span class="identifier">It</span> first<span class="special">,</span> <span class="identifier">It</span> last<span class="special">)</span><span class="special">;</span></pre>
<p class="simpara">
Calculate the combined hash value of the elements of an iterator
range.
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Effects:</span></p></td>
<td>
<p>For the two argument overload:
</p>
<pre class="programlisting">
<span class="identifier">size_t</span> <span class="identifier">seed</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
<span class="keyword">for</span><span class="special">(</span><span class="special">;</span> <span class="identifier">first</span> <span class="special">!=</span> <span class="identifier">last</span><span class="special">;</span> <span class="special">++</span><span class="identifier">first</span><span class="special">)</span>
<span class="special">{</span>
<a class="link" href="reference.html#boost.hash_combine">hash_combine</a><span class="special">(</span><span class="identifier">seed</span><span class="special">,</span> <span class="special">*</span><span class="identifier">first</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span>
<span class="keyword">return</span> <span class="identifier">seed</span><span class="special">;</span>
</pre>
<p>
</p>
<p>For the three arguments overload:</p>
<pre class="programlisting">
<span class="keyword">for</span><span class="special">(</span><span class="special">;</span> <span class="identifier">first</span> <span class="special">!=</span> <span class="identifier">last</span><span class="special">;</span> <span class="special">++</span><span class="identifier">first</span><span class="special">)</span>
<span class="special">{</span>
<a class="link" href="reference.html#boost.hash_combine">hash_combine</a><span class="special">(</span><span class="identifier">seed</span><span class="special">,</span> <span class="special">*</span><span class="identifier">first</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span>
</pre>
</td>
</tr>
<tr>
<td><p><span class="term">Notes:</span></p></td>
<td>
<p>
<code class="computeroutput">hash_range</code> is sensitive to the order of the elements
so it wouldn't be appropriate to use this with an unordered
container.
</p>
<p>This is an extension to TR1</p>
<p>
Forward declared in
<code class="computeroutput"><boost/functional/hash_fwd.hpp></code>
</p>
<p>
This hash function is not intended for general use, and isn't
guaranteed to be equal during separate runs of a program - so
please don't use it for any persistent storage or communication.
</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="reference.html#boost.hash_value_idp528258032">hash_value</a>(std::iterator_traits<It>::value_type)</code>
throws. <code class="computeroutput">hash_range(std::size_t&, It, It)</code> has basic exception safety as long as
<code class="computeroutput"><a class="link" href="reference.html#boost.hash_value_idp528258032">hash_value</a>(std::iterator_traits<It>::value_type)</code>
has basic exception safety.
</p></td>
</tr>
</tbody>
</table></div>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp227516432"></a><h3>
<a name="idp528257088-bb"></a><code class="computeroutput"></code> Overloadable hash implementation (Boost extension).</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p><a name="boost.hash_value_idp528258032"></a></p>
<pre class="literallayout"><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528259216-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">bool</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528260960-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">char</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528262704-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">signed</span> <span class="keyword">char</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528264448-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">char</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528266192-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">wchar_t</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528267936-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">char16_t</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528269680-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">char32_t</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528271424-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">short</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528273168-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">short</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528274912-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">int</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528276656-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">int</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528278400-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">long</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528280144-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">long</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528281888-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">long</span> <span class="keyword">long</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528283632-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">long</span> <span class="keyword">long</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528285376-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">float</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528287120-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">double</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528288864-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">long</span> <span class="keyword">double</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528290608-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">T</span><span class="special">*</span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">unsigned</span> N<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528293040-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">T</span> <span class="special">(</span><span class="special">&</span><span class="identifier">val</span><span class="special">)</span><span class="special">[</span><span class="identifier">N</span><span class="special">]</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">unsigned</span> N<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528296368-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">(</span><span class="special">&</span><span class="identifier">val</span><span class="special">)</span><span class="special">[</span><span class="identifier">N</span><span class="special">]</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Ch<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528299696-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">Ch</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">char_traits</span><span class="special"><</span><span class="identifier">Ch</span><span class="special">></span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> A<span class="special">,</span> <span class="keyword">typename</span> B<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528303360-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special"><</span><span class="identifier">A</span><span class="special">,</span> <span class="identifier">B</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528306672-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528310000-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">list</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528313312-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">deque</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> K<span class="special">,</span> <span class="keyword">typename</span> C<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528316624-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">set</span><span class="special"><</span><span class="identifier">K</span><span class="special">,</span> <span class="identifier">C</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> K<span class="special">,</span> <span class="keyword">typename</span> C<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528320512-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">multiset</span><span class="special"><</span><span class="identifier">K</span><span class="special">,</span> <span class="identifier">C</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> K<span class="special">,</span> <span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> C<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528324400-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special"><</span><span class="identifier">K</span><span class="special">,</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">C</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> K<span class="special">,</span> <span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> C<span class="special">,</span> <span class="keyword">typename</span> A<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528328848-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">multimap</span><span class="special"><</span><span class="identifier">K</span><span class="special">,</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">C</span><span class="special">,</span> <span class="identifier">A</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528333296-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">complex</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528336048-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">type_index</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> N<span class="special">></span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528337792-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">array</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">N</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> val<span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> T<span class="special">></span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a name="idp528341712-bb"></a><span class="identifier">hash_value</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">tuple</span><span class="special"><</span><span class="identifier">T</span><span class="special">...</span><span class="special">></span> val<span class="special">)</span><span class="special">;</span></pre>
<p class="simpara">
Implementation of the hash function.
</p>
<p>
Generally shouldn't be called directly by users, instead they should use
<code class="computeroutput"><a class="link" href="../boost/hash.html" title="Struct template hash">boost::hash</a></code>, <code class="computeroutput"><a class="link" href="reference.html#boost.hash_range_idp528238080">boost::hash_range</a></code>
or <code class="computeroutput"><a class="link" href="reference.html#boost.hash_combine">boost::hash_combine</a></code> which
call <code class="computeroutput">hash_value</code> without namespace qualification so that overloads
for custom types are found via ADL.
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Notes:</span></p></td>
<td>
<p>This is an extension to TR1</p>
<p>
This hash function is not intended for general use, and isn't
guaranteed to be equal during separate runs of a program - so
please don't use it for any persistent storage or communication.
</p>
</td>
</tr>
<tr>
<td><p><span class="term">Throws:</span></p></td>
<td>
Only throws if a user supplied version of
<code class="computeroutput"><a class="link" href="reference.html#boost.hash_value_idp528258032">hash_value</a></code>
throws for an element of a container, or
one of the types stored in a pair.
</td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>Types</th>
<th>Returns</th>
</tr></thead>
<tbody>
<tr>
<td>
<code class="computeroutput">bool</code>,
<code class="computeroutput">char</code>, <code class="computeroutput">signed char</code>, <code class="computeroutput">unsigned char</code>,
<code class="computeroutput">wchar_t</code>, <code class="computeroutput">char16_t</code>, <code class="computeroutput">char32_t</code>,
<code class="computeroutput">short</code>, <code class="computeroutput">unsigned short</code>,
<code class="computeroutput">int</code>, <code class="computeroutput">unsigned int</code>, <code class="computeroutput">long</code>, <code class="computeroutput">unsigned long</code>
</td>
<td><code class="computeroutput">val</code></td>
</tr>
<tr>
<td>
<code class="computeroutput">long long</code>, <code class="computeroutput">unsigned long long</code>
</td>
<td>
<code class="computeroutput">val</code> when <code class="computeroutput">abs(val) <= std::numeric_limits<std::size_t>::max()</code>.</td>
</tr>
<tr>
<td>
<code class="computeroutput">float</code>, <code class="computeroutput">double</code>, <code class="computeroutput">long double</code>
</td>
<td>An unspecified value, except that equal arguments shall yield the same result.</td>
</tr>
<tr>
<td><code class="computeroutput">T*</code></td>
<td>An unspecified value, except that equal arguments shall yield the same result.</td>
</tr>
<tr>
<td>
<code class="computeroutput">T val[N]</code>,
<code class="computeroutput">const T val[N]</code>
</td>
<td><code class="computeroutput">hash_range(val, val+N)</code></td>
</tr>
<tr>
<td>
<code class="computeroutput">std:basic_string<Ch, std::char_traits<Ch>, A></code>,
<code class="computeroutput">std::vector<T, A></code>,
<code class="computeroutput">std::list<T, A></code>,
<code class="computeroutput">std::deque<T, A></code>,
<code class="computeroutput">std::set<K, C, A></code>,
<code class="computeroutput">std::multiset<K, C, A></code>,
<code class="computeroutput">std::map<K, T, C, A></code>,
<code class="computeroutput">std::multimap<K, T, C, A></code>,
<code class="computeroutput">std::array<T, N></code>
</td>
<td><code class="computeroutput">hash_range(val.begin(), val.end())</code></td>
</tr>
<tr>
<td><code class="computeroutput">std::pair<A, B></code></td>
<td><pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">size_t</span> <span class="identifier">seed</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
<a class="link" href="reference.html#boost.hash_combine">hash_combine</a><span class="special">(</span><span class="identifier">seed</span><span class="special">,</span> <span class="identifier">val</span><span class="special">.</span><span class="identifier">first</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="reference.html#boost.hash_combine">hash_combine</a><span class="special">(</span><span class="identifier">seed</span><span class="special">,</span> <span class="identifier">val</span><span class="special">.</span><span class="identifier">second</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">return</span> <span class="identifier">seed</span><span class="special">;</span></pre></td>
</tr>
<tr>
<td><code class="computeroutput">std::tuple<T...></code></td>
<td><pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">size_t</span> <span class="identifier">seed</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
<a class="link" href="reference.html#boost.hash_combine">hash_combine</a><span class="special">(</span><span class="identifier">seed</span><span class="special">,</span> <span class="identifier">get</span><span class="special"><</span><span class="number">0</span><span class="special">></span><span class="special">(</span><span class="identifier">val</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="reference.html#boost.hash_combine">hash_combine</a><span class="special">(</span><span class="identifier">seed</span><span class="special">,</span> <span class="identifier">get</span><span class="special"><</span><span class="number">1</span><span class="special">></span><span class="special">(</span><span class="identifier">val</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// ....</span>
<span class="keyword">return</span> <span class="identifier">seed</span><span class="special">;</span></pre></td>
</tr>
<tr>
<td>
<code class="computeroutput">std::complex<T></code>
</td>
<td>When <code class="computeroutput">T</code> is a built in type and <code class="computeroutput">val.imag() == 0</code>, the result is equal to <code class="computeroutput">hash_value(val.real())</code>. Otherwise an unspecified value, except that equal arguments shall yield the same result.</td>
</tr>
<tr>
<td>
<code class="computeroutput">std::type_index</code>
</td>
<td><code class="computeroutput">val.hash_code()</code></td>
</tr>
</tbody>
</table></div></td>
</tr>
</tbody>
</table></div>
</li></ol></div>
</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>
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