For the full specification, see section 6.3 of the C++ Standard Library Technical Report and issue 6.18 of the Library Extension Technical Report Issues List.

Defines boost::hash, and helper functions. std::unary_function<T, std::size_t> An STL compliant hash function object. std::size_t T const& hash_value(val) The call to hash_value is unqualified, so that custom overloads can be found via argument dependent lookup. This is not defined when the macro BOOST_HASH_NO_EXTENSIONS is defined. The specializations are still defined, so only the specializations required by TR1 are defined. Only throws if hash_value(T) throws. bool std::size_t bool Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw char std::size_t char Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw signed char std::size_t signed char Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw unsigned char std::size_t unsigned char Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw wchar_t std::size_t wchar_t Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw short std::size_t short Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw unsigned short std::size_t unsigned short Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw int std::size_t int Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw unsigned int std::size_t unsigned int Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw long std::size_t long Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw unsigned long std::size_t unsigned long Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw float std::size_t float Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw double std::size_t double Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw long double std::size_t long double Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw std::string std::size_t std::string const& Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw std::wstring std::size_t std::wstring const& Unspecified in TR1, except that equal arguments yield the same result. hash_value(val) in Boost. Doesn't throw void size_t & T const & Called repeatedly to incrementally create a hash value from several variables. seed ^= hash_value(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2); hash_value is called without qualification, so that overloads can be found via ADL. This is an extension to TR1 Only throws if hash_value(T) throws. Strong exception safety, as long as hash_value(T) also has strong exception safety. std::size_t It It void std::size_t& It It Calculate the combined hash value of the elements of an iterator range. For the two argument overload: size_t seed = 0; for(; first != last; ++first) { hash_combine(seed, *first); } return seed; For the three arguments overload: for(; first != last; ++first) { hash_combine(seed, *first); } hash_range is sensitive to the order of the elements so it wouldn't be appropriate to use this with an unordered container. This is an extension to TR1 Only throws if hash_value(std::iterator_traits<It>::value_type) throws. hash_range(std::size_t&, It, It) has basic exception safety as long as hash_value(std::iterator_traits<It>::value_type) has basic exception safety. Implementation of a hash function for integers. Generally shouldn't be called directly by users, instead they should use boost::hash, boost::hash_range or boost::hash_combine which call hash_value without namespace qualification so that overloads for custom types are found via ADL. Overloads for other types supplied in other headers. This is an extension to TR1 std::size_t int std::size_t unsigned int std::size_t long std::size_t unsigned long val Implementation of a hash function for floating point values. Generally shouldn't be called directly by users, instead they should use boost::hash, boost::hash_range or boost::hash_combine which call hash_value without namespace qualification so that overloads for custom types are found via ADL. Overloads for other types supplied in other headers. This is an extension to TR1 std::size_t float std::size_t double std::size_t long double An unspecified value, except that equal arguments shall yield the same result Implementation of a hash function for pointers. Generally shouldn't be called directly by users, instead they should use boost::hash, boost::hash_range or boost::hash_combine which call hash_value without namespace qualification so that overloads for custom types are found via ADL. Overloads for other types supplied in other headers. This is an extension to TR1 std::size_t T* const& An unspecified value, except that equal arguments shall yield the same result Implementation of a hash function for built in arrays. Generally shouldn't be called directly by users, instead they should use boost::hash, boost::hash_range or boost::hash_combine which call hash_value without namespace qualification so that overloads for custom types are found via ADL. Overloads for other types supplied in other headers. This is an extension to TR1 std::size_t T (&val)[N] std::size_t const T (&val)[N] hash_range(val, val+N) Implementation of a hash function for std::basic_string. Generally shouldn't be called directly by users, instead they should use boost::hash, boost::hash_range or boost::hash_combine which call hash_value without namespace qualification so that overloads for custom types are found via ADL. Overloads for other types supplied in other headers. This is an extension to TR1 std::size_t std::basic_string<Ch, std::char_traits<Ch>, A> const& hash_range(val.begin(), val.end()) std::size_t std::pair<A, B> const & size_t seed = 0; hash_combine(seed, val.first); hash_combine(seed, val.second); return seed; Only throws if hash_value(A) or hash_value(B) throws. This is an extension to TR1 std::size_t std::vector<T, A> const & std::size_t std::list<T, A> const & std::size_t std::deque<T, A> const & std::size_t std::set<K, C, A> const & std::size_t std::multiset<K, C, A> const & std::size_t std::map<K, T, C, A> const & std::size_t std::multimap<K, T, C, A> const & hash_range(val.begin(), val.end()); Only throws if hash_value(T) throws. This is an extension to TR1