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