Support typeindex in hash. Refs #4756.

[SVN r68145]

include/boost/functional/hash/hash.hpp

@@ -24,6 +24,10 @@
 #include <boost/type_traits/is_pointer.hpp>
 #endif
 
+#if !defined(BOOST_NO_0X_HDR_TYPEINDEX)
+#include <typeindex>
+#endif
+
 #if BOOST_WORKAROUND(__GNUC__, < 3) \
     && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
 #define BOOST_HASH_CHAR_TRAITS string_char_traits
@@ -87,6 +91,11 @@ namespace boost
     std::size_t hash_value(
         std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const&);
 
+#if !defined(BOOST_NO_0X_HDR_TYPEINDEX)
+    template <class Ch, class A>
+    std::size_t hash_value(std::type_index);
+#endif
+
     // Implementation
 
     namespace hash_detail
@@ -331,6 +340,13 @@ namespace boost
         return boost::hash_detail::float_hash_value(v);
     }
 
+#if !defined(BOOST_NO_0X_HDR_TYPEINDEX)
+    std::size_t hash_value(std::type_index v)
+    {
+        return v.hash_code();
+    }
+#endif
+
     //
     // boost::hash
     //
@@ -435,6 +451,10 @@ namespace boost
     BOOST_HASH_SPECIALIZE(boost::ulong_long_type)
 #endif
 
+#if !defined(BOOST_NO_0X_HDR_TYPEINDEX)
+    BOOST_HASH_SPECIALIZE(std::type_index)
+#endif
+
 #undef BOOST_HASH_SPECIALIZE
 #undef BOOST_HASH_SPECIALIZE_REF