Chris@16: 
Chris@101: // Copyright 2005-2014 Daniel James.
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: //  Based on Peter Dimov's proposal
Chris@16: //  http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1756.pdf
Chris@16: //  issue 6.18. 
Chris@101: //
Chris@101: //  This also contains public domain code from MurmurHash. From the
Chris@101: //  MurmurHash header:
Chris@101: 
Chris@101: // MurmurHash3 was written by Austin Appleby, and is placed in the public
Chris@101: // domain. The author hereby disclaims copyright to this source code.
Chris@16: 
Chris@16: #if !defined(BOOST_FUNCTIONAL_HASH_HASH_HPP)
Chris@16: #define BOOST_FUNCTIONAL_HASH_HASH_HPP
Chris@16: 
Chris@16: #include <boost/functional/hash/hash_fwd.hpp>
Chris@16: #include <functional>
Chris@16: #include <boost/functional/hash/detail/hash_float.hpp>
Chris@16: #include <string>
Chris@16: #include <boost/limits.hpp>
Chris@16: #include <boost/type_traits/is_enum.hpp>
Chris@16: #include <boost/type_traits/is_integral.hpp>
Chris@16: #include <boost/utility/enable_if.hpp>
Chris@101: #include <boost/cstdint.hpp>
Chris@16: 
Chris@16: #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
Chris@16: #include <boost/type_traits/is_pointer.hpp>
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
Chris@16: #include <typeindex>
Chris@16: #endif
Chris@16: 
Chris@16: #if defined(BOOST_MSVC)
Chris@16: #pragma warning(push)
Chris@101: 
Chris@101: #if BOOST_MSVC >= 1400
Chris@16: #pragma warning(disable:6295) // Ill-defined for-loop : 'unsigned int' values
Chris@16:                               // are always of range '0' to '4294967295'.
Chris@16:                               // Loop executes infinitely.
Chris@16: #endif
Chris@16: 
Chris@101: #endif
Chris@101: 
Chris@16: #if BOOST_WORKAROUND(__GNUC__, < 3) \
Chris@16:     && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
Chris@16: #define BOOST_HASH_CHAR_TRAITS string_char_traits
Chris@16: #else
Chris@16: #define BOOST_HASH_CHAR_TRAITS char_traits
Chris@16: #endif
Chris@16: 
Chris@101: #if defined(_MSC_VER)
Chris@101: #   define BOOST_FUNCTIONAL_HASH_ROTL32(x, r) _rotl(x,r)
Chris@101: #else
Chris@101: #   define BOOST_FUNCTIONAL_HASH_ROTL32(x, r) (x << r) | (x >> (32 - r))
Chris@101: #endif
Chris@101: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     namespace hash_detail
Chris@16:     {
Chris@16:         struct enable_hash_value { typedef std::size_t type; };
Chris@16: 
Chris@16:         template <typename T> struct basic_numbers {};
Chris@16:         template <typename T> struct long_numbers;
Chris@16:         template <typename T> struct ulong_numbers;
Chris@16:         template <typename T> struct float_numbers {};
Chris@16: 
Chris@16:         template <> struct basic_numbers<bool> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct basic_numbers<char> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct basic_numbers<unsigned char> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct basic_numbers<signed char> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct basic_numbers<short> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct basic_numbers<unsigned short> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct basic_numbers<int> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct basic_numbers<unsigned int> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct basic_numbers<long> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct basic_numbers<unsigned long> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16: 
Chris@16: #if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
Chris@16:         template <> struct basic_numbers<wchar_t> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16: #endif
Chris@16: 
Chris@16:         // long_numbers is defined like this to allow for separate
Chris@16:         // specialization for long_long and int128_type, in case
Chris@16:         // they conflict.
Chris@16:         template <typename T> struct long_numbers2 {};
Chris@16:         template <typename T> struct ulong_numbers2 {};
Chris@16:         template <typename T> struct long_numbers : long_numbers2<T> {};
Chris@16:         template <typename T> struct ulong_numbers : ulong_numbers2<T> {};
Chris@16: 
Chris@16: #if !defined(BOOST_NO_LONG_LONG)
Chris@16:         template <> struct long_numbers<boost::long_long_type> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct ulong_numbers<boost::ulong_long_type> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16: #endif
Chris@16: 
Chris@16: #if defined(BOOST_HAS_INT128)
Chris@16:         template <> struct long_numbers2<boost::int128_type> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct ulong_numbers2<boost::uint128_type> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16: #endif
Chris@16: 
Chris@16:         template <> struct float_numbers<float> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct float_numbers<double> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:         template <> struct float_numbers<long double> :
Chris@16:             boost::hash_detail::enable_hash_value {};
Chris@16:     }
Chris@16: 
Chris@16:     template <typename T>
Chris@16:     typename boost::hash_detail::basic_numbers<T>::type hash_value(T);
Chris@16:     template <typename T>
Chris@16:     typename boost::hash_detail::long_numbers<T>::type hash_value(T);
Chris@16:     template <typename T>
Chris@16:     typename boost::hash_detail::ulong_numbers<T>::type hash_value(T);
Chris@16: 
Chris@16:     template <typename T>
Chris@16:     typename boost::enable_if<boost::is_enum<T>, std::size_t>::type
Chris@16:         hash_value(T);
Chris@16: 
Chris@16: #if !BOOST_WORKAROUND(__DMC__, <= 0x848)
Chris@16:     template <class T> std::size_t hash_value(T* const&);
Chris@16: #else
Chris@16:     template <class T> std::size_t hash_value(T*);
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
Chris@16:     template< class T, unsigned N >
Chris@16:     std::size_t hash_value(const T (&x)[N]);
Chris@16: 
Chris@16:     template< class T, unsigned N >
Chris@16:     std::size_t hash_value(T (&x)[N]);
Chris@16: #endif
Chris@16: 
Chris@16:     template <class Ch, class A>
Chris@16:     std::size_t hash_value(
Chris@16:         std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const&);
Chris@16: 
Chris@16:     template <typename T>
Chris@16:     typename boost::hash_detail::float_numbers<T>::type hash_value(T);
Chris@16: 
Chris@16: #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
Chris@16:     std::size_t hash_value(std::type_index);
Chris@16: #endif
Chris@16: 
Chris@16:     // Implementation
Chris@16: 
Chris@16:     namespace hash_detail
Chris@16:     {
Chris@16:         template <class T>
Chris@16:         inline std::size_t hash_value_signed(T val)
Chris@16:         {
Chris@16:              const int size_t_bits = std::numeric_limits<std::size_t>::digits;
Chris@16:              // ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1
Chris@16:              const int length = (std::numeric_limits<T>::digits - 1)
Chris@16:                  / size_t_bits;
Chris@16: 
Chris@16:              std::size_t seed = 0;
Chris@16:              T positive = val < 0 ? -1 - val : val;
Chris@16: 
Chris@16:              // Hopefully, this loop can be unrolled.
Chris@16:              for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits)
Chris@16:              {
Chris@16:                  seed ^= (std::size_t) (positive >> i) + (seed<<6) + (seed>>2);
Chris@16:              }
Chris@16:              seed ^= (std::size_t) val + (seed<<6) + (seed>>2);
Chris@16: 
Chris@16:              return seed;
Chris@16:         }
Chris@16: 
Chris@16:         template <class T>
Chris@16:         inline std::size_t hash_value_unsigned(T val)
Chris@16:         {
Chris@16:              const int size_t_bits = std::numeric_limits<std::size_t>::digits;
Chris@16:              // ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1
Chris@16:              const int length = (std::numeric_limits<T>::digits - 1)
Chris@16:                  / size_t_bits;
Chris@16: 
Chris@16:              std::size_t seed = 0;
Chris@16: 
Chris@16:              // Hopefully, this loop can be unrolled.
Chris@16:              for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits)
Chris@16:              {
Chris@16:                  seed ^= (std::size_t) (val >> i) + (seed<<6) + (seed>>2);
Chris@16:              }
Chris@16:              seed ^= (std::size_t) val + (seed<<6) + (seed>>2);
Chris@16: 
Chris@16:              return seed;
Chris@16:         }
Chris@101: 
Chris@101:         template <typename SizeT>
Chris@101:         inline void hash_combine_impl(SizeT& seed, SizeT value)
Chris@101:         {
Chris@101:             seed ^= value + 0x9e3779b9 + (seed<<6) + (seed>>2);
Chris@101:         }
Chris@101: 
Chris@101:         template <typename SizeT>
Chris@101:         inline void hash_combine_impl(boost::uint32_t& h1,
Chris@101:                 boost::uint32_t k1)
Chris@101:         {
Chris@101:             const uint32_t c1 = 0xcc9e2d51;
Chris@101:             const uint32_t c2 = 0x1b873593;
Chris@101: 
Chris@101:             k1 *= c1;
Chris@101:             k1 = BOOST_FUNCTIONAL_HASH_ROTL32(k1,15);
Chris@101:             k1 *= c2;
Chris@101: 
Chris@101:             h1 ^= k1;
Chris@101:             h1 = BOOST_FUNCTIONAL_HASH_ROTL32(h1,13);
Chris@101:             h1 = h1*5+0xe6546b64;
Chris@101:         }
Chris@101: 
Chris@101: 
Chris@101: // Don't define 64-bit hash combine on platforms with 64 bit integers,
Chris@101: // and also not for 32-bit gcc as it warns about the 64-bit constant.
Chris@101: #if !defined(BOOST_NO_INT64_T) && \
Chris@101:         !(defined(__GNUC__) && ULONG_MAX == 0xffffffff)
Chris@101: 
Chris@101:         template <typename SizeT>
Chris@101:         inline void hash_combine_impl(boost::uint64_t& h,
Chris@101:                 boost::uint64_t k)
Chris@101:         {
Chris@101:             const uint64_t m = UINT64_C(0xc6a4a7935bd1e995);
Chris@101:             const int r = 47;
Chris@101: 
Chris@101:             k *= m;
Chris@101:             k ^= k >> r;
Chris@101:             k *= m;
Chris@101: 
Chris@101:             h ^= k;
Chris@101:             h *= m;
Chris@101:         }
Chris@101: 
Chris@101: #endif // BOOST_NO_INT64_T
Chris@16:     }
Chris@16: 
Chris@16:     template <typename T>
Chris@16:     typename boost::hash_detail::basic_numbers<T>::type hash_value(T v)
Chris@16:     {
Chris@16:         return static_cast<std::size_t>(v);
Chris@16:     }
Chris@16: 
Chris@16:     template <typename T>
Chris@16:     typename boost::hash_detail::long_numbers<T>::type hash_value(T v)
Chris@16:     {
Chris@16:         return hash_detail::hash_value_signed(v);
Chris@16:     }
Chris@16: 
Chris@16:     template <typename T>
Chris@16:     typename boost::hash_detail::ulong_numbers<T>::type hash_value(T v)
Chris@16:     {
Chris@16:         return hash_detail::hash_value_unsigned(v);
Chris@16:     }
Chris@16: 
Chris@16:     template <typename T>
Chris@16:     typename boost::enable_if<boost::is_enum<T>, std::size_t>::type
Chris@16:         hash_value(T v)
Chris@16:     {
Chris@16:         return static_cast<std::size_t>(v);
Chris@16:     }
Chris@16: 
Chris@16:     // Implementation by Alberto Barbati and Dave Harris.
Chris@16: #if !BOOST_WORKAROUND(__DMC__, <= 0x848)
Chris@16:     template <class T> std::size_t hash_value(T* const& v)
Chris@16: #else
Chris@16:     template <class T> std::size_t hash_value(T* v)
Chris@16: #endif
Chris@16:     {
Chris@16: #if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
Chris@16:     // for some reason ptrdiff_t on OpenVMS compiler with
Chris@16:     // 64 bit is not 64 bit !!!
Chris@16:         std::size_t x = static_cast<std::size_t>(
Chris@16:            reinterpret_cast<long long int>(v));
Chris@16: #else
Chris@16:         std::size_t x = static_cast<std::size_t>(
Chris@16:            reinterpret_cast<std::ptrdiff_t>(v));
Chris@16: #endif
Chris@16:         return x + (x >> 3);
Chris@16:     }
Chris@16: 
Chris@16: #if defined(BOOST_MSVC)
Chris@16: #pragma warning(push)
Chris@16: #if BOOST_MSVC <= 1400
Chris@16: #pragma warning(disable:4267) // 'argument' : conversion from 'size_t' to
Chris@16:                               // 'unsigned int', possible loss of data
Chris@16:                               // A misguided attempt to detect 64-bit
Chris@16:                               // incompatability.
Chris@16: #endif
Chris@16: #endif
Chris@16: 
Chris@16:     template <class T>
Chris@16:     inline void hash_combine(std::size_t& seed, T const& v)
Chris@16:     {
Chris@16:         boost::hash<T> hasher;
Chris@101:         return boost::hash_detail::hash_combine_impl(seed, hasher(v));
Chris@16:     }
Chris@16: 
Chris@16: #if defined(BOOST_MSVC)
Chris@16: #pragma warning(pop)
Chris@16: #endif
Chris@16: 
Chris@16:     template <class It>
Chris@16:     inline std::size_t hash_range(It first, It last)
Chris@16:     {
Chris@16:         std::size_t seed = 0;
Chris@16: 
Chris@16:         for(; first != last; ++first)
Chris@16:         {
Chris@16:             hash_combine(seed, *first);
Chris@16:         }
Chris@16: 
Chris@16:         return seed;
Chris@16:     }
Chris@16: 
Chris@16:     template <class It>
Chris@16:     inline void hash_range(std::size_t& seed, It first, It last)
Chris@16:     {
Chris@16:         for(; first != last; ++first)
Chris@16:         {
Chris@16:             hash_combine(seed, *first);
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16: #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
Chris@16:     template <class T>
Chris@16:     inline std::size_t hash_range(T* first, T* last)
Chris@16:     {
Chris@16:         std::size_t seed = 0;
Chris@16: 
Chris@16:         for(; first != last; ++first)
Chris@16:         {
Chris@16:             boost::hash<T> hasher;
Chris@16:             seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2);
Chris@16:         }
Chris@16: 
Chris@16:         return seed;
Chris@16:     }
Chris@16: 
Chris@16:     template <class T>
Chris@16:     inline void hash_range(std::size_t& seed, T* first, T* last)
Chris@16:     {
Chris@16:         for(; first != last; ++first)
Chris@16:         {
Chris@16:             boost::hash<T> hasher;
Chris@16:             seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2);
Chris@16:         }
Chris@16:     }
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
Chris@16:     template< class T, unsigned N >
Chris@16:     inline std::size_t hash_value(const T (&x)[N])
Chris@16:     {
Chris@16:         return hash_range(x, x + N);
Chris@16:     }
Chris@16: 
Chris@16:     template< class T, unsigned N >
Chris@16:     inline std::size_t hash_value(T (&x)[N])
Chris@16:     {
Chris@16:         return hash_range(x, x + N);
Chris@16:     }
Chris@16: #endif
Chris@16: 
Chris@16:     template <class Ch, class A>
Chris@16:     inline std::size_t hash_value(
Chris@16:         std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const& v)
Chris@16:     {
Chris@16:         return hash_range(v.begin(), v.end());
Chris@16:     }
Chris@16: 
Chris@16:     template <typename T>
Chris@16:     typename boost::hash_detail::float_numbers<T>::type hash_value(T v)
Chris@16:     {
Chris@16:         return boost::hash_detail::float_hash_value(v);
Chris@16:     }
Chris@16: 
Chris@16: #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
Chris@16:     inline std::size_t hash_value(std::type_index v)
Chris@16:     {
Chris@16:         return v.hash_code();
Chris@16:     }
Chris@16: #endif
Chris@16: 
Chris@16:     //
Chris@16:     // boost::hash
Chris@16:     //
Chris@16:     
Chris@16:     // Define the specializations required by the standard. The general purpose
Chris@16:     // boost::hash is defined later in extensions.hpp if
Chris@16:     // BOOST_HASH_NO_EXTENSIONS is not defined.
Chris@16:     
Chris@16:     // BOOST_HASH_SPECIALIZE - define a specialization for a type which is
Chris@16:     // passed by copy.
Chris@16:     //
Chris@16:     // BOOST_HASH_SPECIALIZE_REF - define a specialization for a type which is
Chris@16:     // passed by copy.
Chris@16:     //
Chris@16:     // These are undefined later.
Chris@16: 
Chris@16: #define BOOST_HASH_SPECIALIZE(type) \
Chris@16:     template <> struct hash<type> \
Chris@16:          : public std::unary_function<type, std::size_t> \
Chris@16:     { \
Chris@16:         std::size_t operator()(type v) const \
Chris@16:         { \
Chris@16:             return boost::hash_value(v); \
Chris@16:         } \
Chris@16:     };
Chris@16: 
Chris@16: #define BOOST_HASH_SPECIALIZE_REF(type) \
Chris@16:     template <> struct hash<type> \
Chris@16:          : public std::unary_function<type, std::size_t> \
Chris@16:     { \
Chris@16:         std::size_t operator()(type const& v) const \
Chris@16:         { \
Chris@16:             return boost::hash_value(v); \
Chris@16:         } \
Chris@16:     };
Chris@16: 
Chris@16:     BOOST_HASH_SPECIALIZE(bool)
Chris@16:     BOOST_HASH_SPECIALIZE(char)
Chris@16:     BOOST_HASH_SPECIALIZE(signed char)
Chris@16:     BOOST_HASH_SPECIALIZE(unsigned char)
Chris@16: #if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
Chris@16:     BOOST_HASH_SPECIALIZE(wchar_t)
Chris@16: #endif
Chris@16:     BOOST_HASH_SPECIALIZE(short)
Chris@16:     BOOST_HASH_SPECIALIZE(unsigned short)
Chris@16:     BOOST_HASH_SPECIALIZE(int)
Chris@16:     BOOST_HASH_SPECIALIZE(unsigned int)
Chris@16:     BOOST_HASH_SPECIALIZE(long)
Chris@16:     BOOST_HASH_SPECIALIZE(unsigned long)
Chris@16: 
Chris@16:     BOOST_HASH_SPECIALIZE(float)
Chris@16:     BOOST_HASH_SPECIALIZE(double)
Chris@16:     BOOST_HASH_SPECIALIZE(long double)
Chris@16: 
Chris@16:     BOOST_HASH_SPECIALIZE_REF(std::string)
Chris@16: #if !defined(BOOST_NO_STD_WSTRING)
Chris@16:     BOOST_HASH_SPECIALIZE_REF(std::wstring)
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined(BOOST_NO_LONG_LONG)
Chris@16:     BOOST_HASH_SPECIALIZE(boost::long_long_type)
Chris@16:     BOOST_HASH_SPECIALIZE(boost::ulong_long_type)
Chris@16: #endif
Chris@16: 
Chris@16: #if defined(BOOST_HAS_INT128)
Chris@16:     BOOST_HASH_SPECIALIZE(boost::int128_type)
Chris@16:     BOOST_HASH_SPECIALIZE(boost::uint128_type)
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX)
Chris@16:     BOOST_HASH_SPECIALIZE(std::type_index)
Chris@16: #endif
Chris@16: 
Chris@16: #undef BOOST_HASH_SPECIALIZE
Chris@16: #undef BOOST_HASH_SPECIALIZE_REF
Chris@16: 
Chris@16: // Specializing boost::hash for pointers.
Chris@16: 
Chris@16: #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
Chris@16: 
Chris@16:     template <class T>
Chris@16:     struct hash<T*>
Chris@16:         : public std::unary_function<T*, std::size_t>
Chris@16:     {
Chris@16:         std::size_t operator()(T* v) const
Chris@16:         {
Chris@16: #if !BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590)
Chris@16:             return boost::hash_value(v);
Chris@16: #else
Chris@16:             std::size_t x = static_cast<std::size_t>(
Chris@16:                 reinterpret_cast<std::ptrdiff_t>(v));
Chris@16: 
Chris@16:             return x + (x >> 3);
Chris@16: #endif
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16: #else
Chris@16: 
Chris@16:     // For compilers without partial specialization, we define a
Chris@16:     // boost::hash for all remaining types. But hash_impl is only defined
Chris@16:     // for pointers in 'extensions.hpp' - so when BOOST_HASH_NO_EXTENSIONS
Chris@16:     // is defined there will still be a compile error for types not supported
Chris@16:     // in the standard.
Chris@16: 
Chris@16:     namespace hash_detail
Chris@16:     {
Chris@16:         template <bool IsPointer>
Chris@16:         struct hash_impl;
Chris@16: 
Chris@16:         template <>
Chris@16:         struct hash_impl<true>
Chris@16:         {
Chris@16:             template <class T>
Chris@16:             struct inner
Chris@16:                 : public std::unary_function<T, std::size_t>
Chris@16:             {
Chris@16:                 std::size_t operator()(T val) const
Chris@16:                 {
Chris@16: #if !BOOST_WORKAROUND(__SUNPRO_CC, <= 590)
Chris@16:                     return boost::hash_value(val);
Chris@16: #else
Chris@16:                     std::size_t x = static_cast<std::size_t>(
Chris@16:                         reinterpret_cast<std::ptrdiff_t>(val));
Chris@16: 
Chris@16:                     return x + (x >> 3);
Chris@16: #endif
Chris@16:                 }
Chris@16:             };
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     template <class T> struct hash
Chris@16:         : public boost::hash_detail::hash_impl<boost::is_pointer<T>::value>
Chris@16:             ::BOOST_NESTED_TEMPLATE inner<T>
Chris@16:     {
Chris@16:     };
Chris@16: 
Chris@16: #endif
Chris@16: }
Chris@16: 
Chris@16: #undef BOOST_HASH_CHAR_TRAITS
Chris@101: #undef BOOST_FUNCTIONAL_HASH_ROTL32
Chris@16: 
Chris@16: #if defined(BOOST_MSVC)
Chris@16: #pragma warning(pop)
Chris@16: #endif
Chris@16: 
Chris@16: #endif // BOOST_FUNCTIONAL_HASH_HASH_HPP
Chris@16: 
Chris@16: // Include this outside of the include guards in case the file is included
Chris@16: // twice - once with BOOST_HASH_NO_EXTENSIONS defined, and then with it
Chris@16: // undefined.
Chris@16: 
Chris@16: #if !defined(BOOST_HASH_NO_EXTENSIONS) \
Chris@16:     && !defined(BOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP)
Chris@16: #include <boost/functional/hash/extensions.hpp>
Chris@16: #endif