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    <p>It depends on the type you are using, if you look <a href="http://boost.org/doc/libs/1_45_0/doc/html/hash/reference.html#header.boost.functional.hash_hpp" rel="noreferrer">here</a> the <code>boost::hash</code> template class is specialised:</p> <pre><code> template&lt;&gt; struct hash&lt;bool&gt;; template&lt;&gt; struct hash&lt;char&gt;; template&lt;&gt; struct hash&lt;signed char&gt;; template&lt;&gt; struct hash&lt;unsigned char&gt;; template&lt;&gt; struct hash&lt;wchar_t&gt;; template&lt;&gt; struct hash&lt;short&gt;; template&lt;&gt; struct hash&lt;unsigned short&gt;; template&lt;&gt; struct hash&lt;int&gt;; template&lt;&gt; struct hash&lt;unsigned int&gt;; template&lt;&gt; struct hash&lt;long&gt;; template&lt;&gt; struct hash&lt;unsigned long&gt;; template&lt;&gt; struct hash&lt;long long&gt;; template&lt;&gt; struct hash&lt;unsigned long long&gt;; template&lt;&gt; struct hash&lt;float&gt;; template&lt;&gt; struct hash&lt;double&gt;; template&lt;&gt; struct hash&lt;long double&gt;; template&lt;&gt; struct hash&lt;std::string&gt;; template&lt;&gt; struct hash&lt;std::wstring&gt;; template&lt;typename T&gt; struct hash&lt;T*&gt;; </code></pre> <p>You can also specify your own hash as the third template argument:</p> <pre><code>namespace boost { template&lt;typename Key, typename Mapped, typename Hash = boost::hash&lt;Key&gt;, typename Pred = std::equal_to&lt;Key&gt;, typename Alloc = std::allocator&lt;std::pair&lt;Key const, Mapped&gt; &gt; &gt; class unordered_map; </code></pre>
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