sl@0: 
sl@0: //  Copyright Daniel James 2005-2006. Use, modification, and distribution are
sl@0: //  subject to the Boost Software License, Version 1.0. (See accompanying
sl@0: //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
sl@0: 
sl@0: //  Based on Peter Dimov's proposal
sl@0: //  http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1756.pdf
sl@0: //  issue 6.18. 
sl@0: /*
sl@0:  * © Portions copyright (c) 2006-2007 Nokia Corporation.  All rights reserved.
sl@0: */
sl@0: #if !defined(BOOST_FUNCTIONAL_HASH_HASH_HPP)
sl@0: #define BOOST_FUNCTIONAL_HASH_HASH_HPP
sl@0: 
sl@0: #include <boost/functional/hash_fwd.hpp>
sl@0: #include <functional>
sl@0: #include <boost/functional/detail/hash_float.hpp>
sl@0: #include <boost/functional/detail/container_fwd.hpp>
sl@0: #include <string>
sl@0: 
sl@0: #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
sl@0: #include <boost/type_traits/is_pointer.hpp>
sl@0: #endif
sl@0: 
sl@0: #if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
sl@0: #include <boost/type_traits/is_array.hpp>
sl@0: #endif
sl@0: 
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0: #include <boost/type_traits/is_const.hpp>
sl@0: #endif
sl@0: 
sl@0: namespace boost
sl@0: {
sl@0: #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
sl@0:     // Borland complains about an ambiguous function overload
sl@0:     // when compiling boost::hash<bool>.
sl@0:     std::size_t hash_value(bool);
sl@0: #endif
sl@0:     
sl@0:     std::size_t hash_value(int);
sl@0:     std::size_t hash_value(unsigned int);
sl@0:     std::size_t hash_value(long);
sl@0:     std::size_t hash_value(unsigned long);
sl@0: 
sl@0: #if defined(BOOST_MSVC) && defined(_WIN64)
sl@0:     // On 64-bit windows std::size_t is a typedef for unsigned long long, which
sl@0:     // isn't due to be supported until Boost 1.35. So add support here.
sl@0:     // (Technically, Boost.Hash isn't actually documented as supporting
sl@0:     // std::size_t. But it would be pretty silly not to).
sl@0:     std::size_t hash_value(std::size_t);
sl@0: #endif
sl@0: 
sl@0: #if !BOOST_WORKAROUND(__DMC__, <= 0x848)
sl@0:     template <class T> std::size_t hash_value(T* const&);
sl@0: #else
sl@0:     template <class T> std::size_t hash_value(T*);
sl@0: #endif
sl@0: 
sl@0: #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
sl@0:     template< class T, unsigned N >
sl@0:     std::size_t hash_value(const T (&array)[N]);
sl@0: 
sl@0:     template< class T, unsigned N >
sl@0:     std::size_t hash_value(T (&array)[N]);
sl@0: #endif
sl@0: 
sl@0:     std::size_t hash_value(float v);
sl@0:     std::size_t hash_value(double v);
sl@0:     std::size_t hash_value(long double v);
sl@0: 
sl@0:     template <class Ch, class A>
sl@0:     std::size_t hash_value(std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const&);
sl@0: 
sl@0:     template <class A, class B>
sl@0:     std::size_t hash_value(std::pair<A, B> const&);
sl@0:     template <class T, class A>
sl@0:     std::size_t hash_value(std::vector<T, A> const&);
sl@0:     template <class T, class A>
sl@0:     std::size_t hash_value(std::list<T, A> const& v);
sl@0:     template <class T, class A>
sl@0:     std::size_t hash_value(std::deque<T, A> const& v);
sl@0:     template <class K, class C, class A>
sl@0:     std::size_t hash_value(std::set<K, C, A> const& v);
sl@0:     template <class K, class C, class A>
sl@0:     std::size_t hash_value(std::multiset<K, C, A> const& v);
sl@0:     template <class K, class T, class C, class A>
sl@0:     std::size_t hash_value(std::map<K, T, C, A> const& v);
sl@0:     template <class K, class T, class C, class A>
sl@0:     std::size_t hash_value(std::multimap<K, T, C, A> const& v);
sl@0: 
sl@0:     // Implementation
sl@0: 
sl@0: #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
sl@0:     inline std::size_t hash_value(bool v)
sl@0:     {
sl@0:         return static_cast<std::size_t>(v);
sl@0:     }
sl@0: #endif
sl@0: 
sl@0:     inline std::size_t hash_value(int v)
sl@0:     {
sl@0:         return static_cast<std::size_t>(v);
sl@0:     }
sl@0: 
sl@0:     inline std::size_t hash_value(unsigned int v)
sl@0:     {
sl@0:         return static_cast<std::size_t>(v);
sl@0:     }
sl@0: 
sl@0:     inline std::size_t hash_value(long v)
sl@0:     {
sl@0:         return static_cast<std::size_t>(v);
sl@0:     }
sl@0: 
sl@0:     inline std::size_t hash_value(unsigned long v)
sl@0:     {
sl@0:         return static_cast<std::size_t>(v);
sl@0:     }
sl@0: 
sl@0: #if defined(_M_X64) && defined(_WIN64)
sl@0:     inline std::size_t hash_value(long long v)
sl@0:     {
sl@0:         return v;
sl@0:     }
sl@0: 
sl@0:     inline std::size_t hash_value(unsigned long long v)
sl@0:     {
sl@0:         return v;
sl@0:     }
sl@0: #endif
sl@0: 
sl@0:     // Implementation by Alberto Barbati and Dave Harris.
sl@0: #if !BOOST_WORKAROUND(__DMC__, <= 0x848)
sl@0:     template <class T> std::size_t hash_value(T* const& v)
sl@0: #else
sl@0:     template <class T> std::size_t hash_value(T* v)
sl@0: #endif
sl@0:     {
sl@0:         std::size_t x = static_cast<std::size_t>(
sl@0:            reinterpret_cast<std::ptrdiff_t>(v));
sl@0:         return x + (x >> 3);
sl@0:     }
sl@0: 
sl@0: #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0:     template <class T>
sl@0:     inline void hash_combine(std::size_t& seed, T& v)
sl@0: #else
sl@0:     template <class T>
sl@0:     inline void hash_combine(std::size_t& seed, T const& v)
sl@0: #endif
sl@0:     {
sl@0:         boost::hash<T> hasher;
sl@0:         seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
sl@0:     }
sl@0: 
sl@0:     template <class It>
sl@0:     inline std::size_t hash_range(It first, It last)
sl@0:     {
sl@0:         std::size_t seed = 0;
sl@0: 
sl@0:         for(; first != last; ++first)
sl@0:         {
sl@0:             hash_combine(seed, *first);
sl@0:         }
sl@0: 
sl@0:         return seed;
sl@0:     }
sl@0: 
sl@0:     template <class It>
sl@0:     inline void hash_range(std::size_t& seed, It first, It last)
sl@0:     {
sl@0:         for(; first != last; ++first)
sl@0:         {
sl@0:             hash_combine(seed, *first);
sl@0:         }
sl@0:     }
sl@0: 
sl@0: #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
sl@0:     template <class T>
sl@0:     inline std::size_t hash_range(T* first, T* last)
sl@0:     {
sl@0:         std::size_t seed = 0;
sl@0: 
sl@0:         for(; first != last; ++first)
sl@0:         {
sl@0:             boost::hash<T> hasher;
sl@0:             seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2);
sl@0:         }
sl@0: 
sl@0:         return seed;
sl@0:     }
sl@0: 
sl@0:     template <class T>
sl@0:     inline void hash_range(std::size_t& seed, T* first, T* last)
sl@0:     {
sl@0:         for(; first != last; ++first)
sl@0:         {
sl@0:             boost::hash<T> hasher;
sl@0:             seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2);
sl@0:         }
sl@0:     }
sl@0: #endif
sl@0: 
sl@0: #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
sl@0:     template< class T, unsigned N >
sl@0:     inline std::size_t hash_value(const T (&array)[N])
sl@0:     {
sl@0:         return hash_range(array, array + N);
sl@0:     }
sl@0: 
sl@0:     template< class T, unsigned N >
sl@0:     inline std::size_t hash_value(T (&array)[N])
sl@0:     {
sl@0:         return hash_range(array, array + N);
sl@0:     }
sl@0: #endif
sl@0: 
sl@0:     template <class Ch, class A>
sl@0:     inline std::size_t hash_value(std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const& v)
sl@0:     {
sl@0:         return hash_range(v.begin(), v.end());
sl@0:     }
sl@0: 
sl@0:     inline std::size_t hash_value(float v)
sl@0:     {
sl@0:         return boost::hash_detail::float_hash_value(v);
sl@0:     }
sl@0: 
sl@0:     inline std::size_t hash_value(double v)
sl@0:     {
sl@0:         return boost::hash_detail::float_hash_value(v);
sl@0:     }
sl@0: 
sl@0: #ifndef __SYMBIAN32__ //long double not supported
sl@0:     inline std::size_t hash_value(long double v)
sl@0:     {
sl@0:         return boost::hash_detail::float_hash_value(v);
sl@0:     }
sl@0: #endif
sl@0:     template <class A, class B>
sl@0:     std::size_t hash_value(std::pair<A, B> const& v)
sl@0:     {
sl@0:         std::size_t seed = 0;
sl@0:         hash_combine(seed, v.first);
sl@0:         hash_combine(seed, v.second);
sl@0:         return seed;
sl@0:     }
sl@0: 
sl@0:     template <class T, class A>
sl@0:     std::size_t hash_value(std::vector<T, A> const& v)
sl@0:     {
sl@0:         return hash_range(v.begin(), v.end());
sl@0:     }
sl@0: 
sl@0:     template <class T, class A>
sl@0:     std::size_t hash_value(std::list<T, A> const& v)
sl@0:     {
sl@0:         return hash_range(v.begin(), v.end());
sl@0:     }
sl@0: 
sl@0:     template <class T, class A>
sl@0:     std::size_t hash_value(std::deque<T, A> const& v)
sl@0:     {
sl@0:         return hash_range(v.begin(), v.end());
sl@0:     }
sl@0: 
sl@0:     template <class K, class C, class A>
sl@0:     std::size_t hash_value(std::set<K, C, A> const& v)
sl@0:     {
sl@0:         return hash_range(v.begin(), v.end());
sl@0:     }
sl@0: 
sl@0:     template <class K, class C, class A>
sl@0:     std::size_t hash_value(std::multiset<K, C, A> const& v)
sl@0:     {
sl@0:         return hash_range(v.begin(), v.end());
sl@0:     }
sl@0: 
sl@0:     template <class K, class T, class C, class A>
sl@0:     std::size_t hash_value(std::map<K, T, C, A> const& v)
sl@0:     {
sl@0:         return hash_range(v.begin(), v.end());
sl@0:     }
sl@0: 
sl@0:     template <class K, class T, class C, class A>
sl@0:     std::size_t hash_value(std::multimap<K, T, C, A> const& v)
sl@0:     {
sl@0:         return hash_range(v.begin(), v.end());
sl@0:     }
sl@0: 
sl@0:     //
sl@0:     // boost::hash
sl@0:     //
sl@0: 
sl@0: #if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0: #define BOOST_HASH_SPECIALIZE(type) \
sl@0:     template <> struct hash<type> \
sl@0:          : public std::unary_function<type, std::size_t> \
sl@0:     { \
sl@0:         std::size_t operator()(type v) const \
sl@0:         { \
sl@0:             return boost::hash_value(v); \
sl@0:         } \
sl@0:     };
sl@0: 
sl@0: #define BOOST_HASH_SPECIALIZE_REF(type) \
sl@0:     template <> struct hash<type> \
sl@0:          : public std::unary_function<type, std::size_t> \
sl@0:     { \
sl@0:         std::size_t operator()(type const& v) const \
sl@0:         { \
sl@0:             return boost::hash_value(v); \
sl@0:         } \
sl@0:     };
sl@0: #else
sl@0: #define BOOST_HASH_SPECIALIZE(type) \
sl@0:     template <> struct hash<type> \
sl@0:          : public std::unary_function<type, std::size_t> \
sl@0:     { \
sl@0:         std::size_t operator()(type v) const \
sl@0:         { \
sl@0:             return boost::hash_value(v); \
sl@0:         } \
sl@0:     }; \
sl@0:     \
sl@0:     template <> struct hash<const type> \
sl@0:          : public std::unary_function<const type, std::size_t> \
sl@0:     { \
sl@0:         std::size_t operator()(const type v) const \
sl@0:         { \
sl@0:             return boost::hash_value(v); \
sl@0:         } \
sl@0:     };
sl@0: 
sl@0: #define BOOST_HASH_SPECIALIZE_REF(type) \
sl@0:     template <> struct hash<type> \
sl@0:          : public std::unary_function<type, std::size_t> \
sl@0:     { \
sl@0:         std::size_t operator()(type const& v) const \
sl@0:         { \
sl@0:             return boost::hash_value(v); \
sl@0:         } \
sl@0:     }; \
sl@0:     \
sl@0:     template <> struct hash<const type> \
sl@0:          : public std::unary_function<const type, std::size_t> \
sl@0:     { \
sl@0:         std::size_t operator()(type const& v) const \
sl@0:         { \
sl@0:             return boost::hash_value(v); \
sl@0:         } \
sl@0:     };
sl@0: #endif
sl@0: 
sl@0:     BOOST_HASH_SPECIALIZE(bool)
sl@0:     BOOST_HASH_SPECIALIZE(char)
sl@0:     BOOST_HASH_SPECIALIZE(signed char)
sl@0:     BOOST_HASH_SPECIALIZE(unsigned char)
sl@0: #if !defined(BOOST_NO_INTRINSIC_WCHAR_T) || defined(__SYMBIAN32__)
sl@0:     BOOST_HASH_SPECIALIZE(wchar_t)
sl@0: #endif
sl@0:     BOOST_HASH_SPECIALIZE(short)
sl@0:     BOOST_HASH_SPECIALIZE(unsigned short)
sl@0:     BOOST_HASH_SPECIALIZE(int)
sl@0:     BOOST_HASH_SPECIALIZE(unsigned int)
sl@0:     BOOST_HASH_SPECIALIZE(long)
sl@0:     BOOST_HASH_SPECIALIZE(unsigned long)
sl@0: 
sl@0:     BOOST_HASH_SPECIALIZE(float)
sl@0:     BOOST_HASH_SPECIALIZE(double)
sl@0:     BOOST_HASH_SPECIALIZE(long double)
sl@0: 
sl@0:     BOOST_HASH_SPECIALIZE_REF(std::string)
sl@0: #if !defined(BOOST_NO_STD_WSTRING)
sl@0:     BOOST_HASH_SPECIALIZE_REF(std::wstring)
sl@0: #endif
sl@0: 
sl@0: #undef BOOST_HASH_SPECIALIZE
sl@0: #undef BOOST_HASH_SPECIALIZE_REF
sl@0: 
sl@0: #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
sl@0:     template <class T>
sl@0:     struct hash<T*>
sl@0:         : public std::unary_function<T*, std::size_t>
sl@0:     {
sl@0:         std::size_t operator()(T* v) const \
sl@0:         { \
sl@0:             return boost::hash_value(v); \
sl@0:         } \
sl@0:     };
sl@0: #else
sl@0:     namespace hash_detail
sl@0:     {
sl@0:         template <bool IsPointer>
sl@0:         struct hash_impl;
sl@0: 
sl@0:         template <>
sl@0:         struct hash_impl<true>
sl@0:         {
sl@0:             template <class T>
sl@0:             struct inner
sl@0:                 : public std::unary_function<T, std::size_t>
sl@0:             {
sl@0:                 std::size_t operator()(T val) const
sl@0:                 {
sl@0:                     return boost::hash_value(val);
sl@0:                 }
sl@0:             };
sl@0:         };
sl@0:     }
sl@0: 
sl@0:     template <class T> struct hash
sl@0:         : public boost::hash_detail::hash_impl<boost::is_pointer<T>::value>
sl@0:             ::BOOST_NESTED_TEMPLATE inner<T>
sl@0:     {
sl@0:     };
sl@0: #endif
sl@0: }
sl@0: 
sl@0: #endif // BOOST_FUNCTIONAL_HASH_HASH_HPP
sl@0: 
sl@0: ////////////////////////////////////////////////////////////////////////////////
sl@0: 
sl@0: #if !defined(BOOST_HASH_NO_EXTENSIONS) \
sl@0:     && !defined(BOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP)
sl@0: #define BOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP
sl@0: 
sl@0: namespace boost
sl@0: {
sl@0: 
sl@0: #if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
sl@0:     namespace hash_detail
sl@0:     {
sl@0:         template <bool IsArray>
sl@0:         struct call_hash_impl
sl@0:         {
sl@0:             template <class T>
sl@0:             struct inner
sl@0:             {
sl@0:                 static std::size_t call(T const& v)
sl@0:                 {
sl@0:                     using namespace boost;
sl@0:                     return hash_value(v);
sl@0:                 }
sl@0:             };
sl@0:         };
sl@0: 
sl@0:         template <>
sl@0:         struct call_hash_impl<true>
sl@0:         {
sl@0:             template <class Array>
sl@0:             struct inner
sl@0:             {
sl@0: #if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0:                 static std::size_t call(Array const& v)
sl@0: #else
sl@0:                 static std::size_t call(Array& v)
sl@0: #endif
sl@0:                 {
sl@0:                     const int size = sizeof(v) / sizeof(*v);
sl@0:                     return boost::hash_range(v, v + size);
sl@0:                 }
sl@0:             };
sl@0:         };
sl@0: 
sl@0:         template <class T>
sl@0:         struct call_hash
sl@0:             : public call_hash_impl<boost::is_array<T>::value>
sl@0:                 ::BOOST_NESTED_TEMPLATE inner<T>
sl@0:         {
sl@0:         };
sl@0:     }
sl@0: #endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
sl@0: 
sl@0: #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
sl@0: 
sl@0:     template <class T> struct hash
sl@0:         : std::unary_function<T, std::size_t>
sl@0:     {
sl@0: #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
sl@0:         std::size_t operator()(T const& val) const
sl@0:         {
sl@0:             return hash_value(val);
sl@0:         }
sl@0: #else
sl@0:         std::size_t operator()(T const& val) const
sl@0:         {
sl@0:             return hash_detail::call_hash<T>::call(val);
sl@0:         }
sl@0: #endif
sl@0:     };
sl@0: 
sl@0: #if BOOST_WORKAROUND(__DMC__, <= 0x848)
sl@0:     template <class T, unsigned int n> struct hash<T[n]>
sl@0:         : std::unary_function<T[n], std::size_t>
sl@0:     {
sl@0:         std::size_t operator()(const T* val) const
sl@0:         {
sl@0:             return boost::hash_range(val, val+n);
sl@0:         }
sl@0:     };
sl@0: #endif
sl@0: 
sl@0: #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
sl@0: 
sl@0:     // On compilers without partial specialization, boost::hash<T>
sl@0:     // has already been declared to deal with pointers, so just
sl@0:     // need to supply the non-pointer version.
sl@0: 
sl@0:     namespace hash_detail
sl@0:     {
sl@0:         template <bool IsPointer>
sl@0:         struct hash_impl;
sl@0: 
sl@0: #if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
sl@0: 
sl@0:         template <>
sl@0:         struct hash_impl<false>
sl@0:         {
sl@0:             template <class T>
sl@0:             struct inner
sl@0:                 : std::unary_function<T, std::size_t>
sl@0:             {
sl@0: #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
sl@0:                 std::size_t operator()(T const& val) const
sl@0:                 {
sl@0:                     return hash_value(val);
sl@0:                 }
sl@0: #else
sl@0:                 std::size_t operator()(T const& val) const
sl@0:                 {
sl@0:                     return hash_detail::call_hash<T>::call(val);
sl@0:                 }
sl@0: #endif
sl@0:             };
sl@0:         };
sl@0: 
sl@0: #else // Visual C++ 6.5
sl@0: 
sl@0:     // There's probably a more elegant way to Visual C++ 6.5 to work
sl@0:     // but I don't know what it is.
sl@0: 
sl@0:         template <bool IsConst>
sl@0:         struct hash_impl_msvc
sl@0:         {
sl@0:             template <class T>
sl@0:             struct inner
sl@0:                 : public std::unary_function<T, std::size_t>
sl@0:             {
sl@0:                 std::size_t operator()(T const& val) const
sl@0:                 {
sl@0:                     return hash_detail::call_hash<T const>::call(val);
sl@0:                 }
sl@0: 
sl@0:                 std::size_t operator()(T& val) const
sl@0:                 {
sl@0:                     return hash_detail::call_hash<T>::call(val);
sl@0:                 }
sl@0:             };
sl@0:         };
sl@0: 
sl@0:         template <>
sl@0:         struct hash_impl_msvc<true>
sl@0:         {
sl@0:             template <class T>
sl@0:             struct inner
sl@0:                 : public std::unary_function<T, std::size_t>
sl@0:             {
sl@0:                 std::size_t operator()(T& val) const
sl@0:                 {
sl@0:                     return hash_detail::call_hash<T>::call(val);
sl@0:                 }
sl@0:             };
sl@0:         };
sl@0:         
sl@0:         template <class T>
sl@0:         struct hash_impl_msvc2
sl@0:             : public hash_impl_msvc<boost::is_const<T>::value>
sl@0:                     ::BOOST_NESTED_TEMPLATE inner<T> {};
sl@0:         
sl@0:         template <>
sl@0:         struct hash_impl<false>
sl@0:         {
sl@0:             template <class T>
sl@0:             struct inner : public hash_impl_msvc2<T> {};
sl@0:         };
sl@0: 
sl@0: #endif // Visual C++ 6.5
sl@0:     }
sl@0: #endif  // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
sl@0: }
sl@0: 
sl@0: #endif
sl@0: