diff options
Diffstat (limited to 'boost/functional/hash/hash.hpp')
| -rw-r--r-- | boost/functional/hash/hash.hpp | 593 |
1 files changed, 2 insertions, 591 deletions
diff --git a/boost/functional/hash/hash.hpp b/boost/functional/hash/hash.hpp index b461f5f0d7..327a3ecae7 100644 --- a/boost/functional/hash/hash.hpp +++ b/boost/functional/hash/hash.hpp @@ -1,595 +1,6 @@ -// Copyright 2005-2014 Daniel James. +// Copyright 2005-2009 Daniel James. // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -// Based on Peter Dimov's proposal -// http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1756.pdf -// issue 6.18. -// -// This also contains public domain code from MurmurHash. From the -// MurmurHash header: - -// MurmurHash3 was written by Austin Appleby, and is placed in the public -// domain. The author hereby disclaims copyright to this source code. - -#if !defined(BOOST_FUNCTIONAL_HASH_HASH_HPP) -#define BOOST_FUNCTIONAL_HASH_HASH_HPP - -#include <boost/functional/hash/hash_fwd.hpp> -#include <functional> -#include <boost/functional/hash/detail/hash_float.hpp> -#include <string> -#include <boost/limits.hpp> -#include <boost/type_traits/is_enum.hpp> -#include <boost/type_traits/is_integral.hpp> -#include <boost/utility/enable_if.hpp> -#include <boost/cstdint.hpp> - -#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) -#include <boost/type_traits/is_pointer.hpp> -#endif - -#if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX) -#include <typeindex> -#endif - -#if defined(BOOST_MSVC) -#pragma warning(push) - -#if BOOST_MSVC >= 1400 -#pragma warning(disable:6295) // Ill-defined for-loop : 'unsigned int' values - // are always of range '0' to '4294967295'. - // Loop executes infinitely. -#endif - -#endif - -#if BOOST_WORKAROUND(__GNUC__, < 3) \ - && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION) -#define BOOST_HASH_CHAR_TRAITS string_char_traits -#else -#define BOOST_HASH_CHAR_TRAITS char_traits -#endif - -#if defined(_MSC_VER) -# define BOOST_FUNCTIONAL_HASH_ROTL32(x, r) _rotl(x,r) -#else -# define BOOST_FUNCTIONAL_HASH_ROTL32(x, r) (x << r) | (x >> (32 - r)) -#endif - -namespace boost -{ - namespace hash_detail - { -#if defined(_HAS_AUTO_PTR_ETC) && !_HAS_AUTO_PTR_ETC - template <typename T> - struct hash_base - { - typedef T argument_type; - typedef std::size_t result_type; - }; -#else - template <typename T> - struct hash_base : std::unary_function<T, std::size_t> {}; -#endif - - struct enable_hash_value { typedef std::size_t type; }; - - template <typename T> struct basic_numbers {}; - template <typename T> struct long_numbers; - template <typename T> struct ulong_numbers; - template <typename T> struct float_numbers {}; - - template <> struct basic_numbers<bool> : - boost::hash_detail::enable_hash_value {}; - template <> struct basic_numbers<char> : - boost::hash_detail::enable_hash_value {}; - template <> struct basic_numbers<unsigned char> : - boost::hash_detail::enable_hash_value {}; - template <> struct basic_numbers<signed char> : - boost::hash_detail::enable_hash_value {}; - template <> struct basic_numbers<short> : - boost::hash_detail::enable_hash_value {}; - template <> struct basic_numbers<unsigned short> : - boost::hash_detail::enable_hash_value {}; - template <> struct basic_numbers<int> : - boost::hash_detail::enable_hash_value {}; - template <> struct basic_numbers<unsigned int> : - boost::hash_detail::enable_hash_value {}; - template <> struct basic_numbers<long> : - boost::hash_detail::enable_hash_value {}; - template <> struct basic_numbers<unsigned long> : - boost::hash_detail::enable_hash_value {}; - -#if !defined(BOOST_NO_INTRINSIC_WCHAR_T) - template <> struct basic_numbers<wchar_t> : - boost::hash_detail::enable_hash_value {}; -#endif - -#if !defined(BOOST_NO_CXX11_CHAR16_T) - template <> struct basic_numbers<char16_t> : - boost::hash_detail::enable_hash_value {}; -#endif - -#if !defined(BOOST_NO_CXX11_CHAR32_T) - template <> struct basic_numbers<char32_t> : - boost::hash_detail::enable_hash_value {}; -#endif - - // long_numbers is defined like this to allow for separate - // specialization for long_long and int128_type, in case - // they conflict. - template <typename T> struct long_numbers2 {}; - template <typename T> struct ulong_numbers2 {}; - template <typename T> struct long_numbers : long_numbers2<T> {}; - template <typename T> struct ulong_numbers : ulong_numbers2<T> {}; - -#if !defined(BOOST_NO_LONG_LONG) - template <> struct long_numbers<boost::long_long_type> : - boost::hash_detail::enable_hash_value {}; - template <> struct ulong_numbers<boost::ulong_long_type> : - boost::hash_detail::enable_hash_value {}; -#endif - -#if defined(BOOST_HAS_INT128) - template <> struct long_numbers2<boost::int128_type> : - boost::hash_detail::enable_hash_value {}; - template <> struct ulong_numbers2<boost::uint128_type> : - boost::hash_detail::enable_hash_value {}; -#endif - - template <> struct float_numbers<float> : - boost::hash_detail::enable_hash_value {}; - template <> struct float_numbers<double> : - boost::hash_detail::enable_hash_value {}; - template <> struct float_numbers<long double> : - boost::hash_detail::enable_hash_value {}; - } - - template <typename T> - typename boost::hash_detail::basic_numbers<T>::type hash_value(T); - template <typename T> - typename boost::hash_detail::long_numbers<T>::type hash_value(T); - template <typename T> - typename boost::hash_detail::ulong_numbers<T>::type hash_value(T); - - template <typename T> - typename boost::enable_if<boost::is_enum<T>, std::size_t>::type - hash_value(T); - -#if !BOOST_WORKAROUND(__DMC__, <= 0x848) - template <class T> std::size_t hash_value(T* const&); -#else - template <class T> std::size_t hash_value(T*); -#endif - -#if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) - template< class T, unsigned N > - std::size_t hash_value(const T (&x)[N]); - - template< class T, unsigned N > - std::size_t hash_value(T (&x)[N]); -#endif - - template <class Ch, class A> - std::size_t hash_value( - std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const&); - - template <typename T> - typename boost::hash_detail::float_numbers<T>::type hash_value(T); - -#if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX) - std::size_t hash_value(std::type_index); -#endif - - // Implementation - - namespace hash_detail - { - template <class T> - inline std::size_t hash_value_signed(T val) - { - const unsigned int size_t_bits = std::numeric_limits<std::size_t>::digits; - // ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1 - const int length = (std::numeric_limits<T>::digits - 1) - / static_cast<int>(size_t_bits); - - std::size_t seed = 0; - T positive = val < 0 ? -1 - val : val; - - // Hopefully, this loop can be unrolled. - for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits) - { - seed ^= (std::size_t) (positive >> i) + (seed<<6) + (seed>>2); - } - seed ^= (std::size_t) val + (seed<<6) + (seed>>2); - - return seed; - } - - template <class T> - inline std::size_t hash_value_unsigned(T val) - { - const unsigned int size_t_bits = std::numeric_limits<std::size_t>::digits; - // ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1 - const int length = (std::numeric_limits<T>::digits - 1) - / static_cast<int>(size_t_bits); - - std::size_t seed = 0; - - // Hopefully, this loop can be unrolled. - for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits) - { - seed ^= (std::size_t) (val >> i) + (seed<<6) + (seed>>2); - } - seed ^= (std::size_t) val + (seed<<6) + (seed>>2); - - return seed; - } - - template <typename SizeT> - inline void hash_combine_impl(SizeT& seed, SizeT value) - { - seed ^= value + 0x9e3779b9 + (seed<<6) + (seed>>2); - } - - inline void hash_combine_impl(boost::uint32_t& h1, - boost::uint32_t k1) - { - const uint32_t c1 = 0xcc9e2d51; - const uint32_t c2 = 0x1b873593; - - k1 *= c1; - k1 = BOOST_FUNCTIONAL_HASH_ROTL32(k1,15); - k1 *= c2; - - h1 ^= k1; - h1 = BOOST_FUNCTIONAL_HASH_ROTL32(h1,13); - h1 = h1*5+0xe6546b64; - } - - -// Don't define 64-bit hash combine on platforms without 64 bit integers, -// and also not for 32-bit gcc as it warns about the 64-bit constant. -#if !defined(BOOST_NO_INT64_T) && \ - !(defined(__GNUC__) && ULONG_MAX == 0xffffffff) - - inline void hash_combine_impl(boost::uint64_t& h, - boost::uint64_t k) - { - const boost::uint64_t m = UINT64_C(0xc6a4a7935bd1e995); - const int r = 47; - - k *= m; - k ^= k >> r; - k *= m; - - h ^= k; - h *= m; - - // Completely arbitrary number, to prevent 0's - // from hashing to 0. - h += 0xe6546b64; - } - -#endif // BOOST_NO_INT64_T - } - - template <typename T> - typename boost::hash_detail::basic_numbers<T>::type hash_value(T v) - { - return static_cast<std::size_t>(v); - } - - template <typename T> - typename boost::hash_detail::long_numbers<T>::type hash_value(T v) - { - return hash_detail::hash_value_signed(v); - } - - template <typename T> - typename boost::hash_detail::ulong_numbers<T>::type hash_value(T v) - { - return hash_detail::hash_value_unsigned(v); - } - - template <typename T> - typename boost::enable_if<boost::is_enum<T>, std::size_t>::type - hash_value(T v) - { - return static_cast<std::size_t>(v); - } - - // Implementation by Alberto Barbati and Dave Harris. -#if !BOOST_WORKAROUND(__DMC__, <= 0x848) - template <class T> std::size_t hash_value(T* const& v) -#else - template <class T> std::size_t hash_value(T* v) -#endif - { -#if defined(__VMS) && __INITIAL_POINTER_SIZE == 64 - // for some reason ptrdiff_t on OpenVMS compiler with - // 64 bit is not 64 bit !!! - std::size_t x = static_cast<std::size_t>( - reinterpret_cast<long long int>(v)); -#else - std::size_t x = static_cast<std::size_t>( - reinterpret_cast<std::ptrdiff_t>(v)); -#endif - return x + (x >> 3); - } - -#if defined(BOOST_MSVC) -#pragma warning(push) -#if BOOST_MSVC <= 1400 -#pragma warning(disable:4267) // 'argument' : conversion from 'size_t' to - // 'unsigned int', possible loss of data - // A misguided attempt to detect 64-bit - // incompatability. -#endif -#endif - - template <class T> - inline void hash_combine(std::size_t& seed, T const& v) - { - boost::hash<T> hasher; - return boost::hash_detail::hash_combine_impl(seed, hasher(v)); - } - -#if defined(BOOST_MSVC) -#pragma warning(pop) -#endif - - template <class It> - inline std::size_t hash_range(It first, It last) - { - std::size_t seed = 0; - - for(; first != last; ++first) - { - hash_combine(seed, *first); - } - - return seed; - } - - template <class It> - inline void hash_range(std::size_t& seed, It first, It last) - { - for(; first != last; ++first) - { - hash_combine(seed, *first); - } - } - -#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551)) - template <class T> - inline std::size_t hash_range(T* first, T* last) - { - std::size_t seed = 0; - - for(; first != last; ++first) - { - boost::hash<T> hasher; - seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2); - } - - return seed; - } - - template <class T> - inline void hash_range(std::size_t& seed, T* first, T* last) - { - for(; first != last; ++first) - { - boost::hash<T> hasher; - seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2); - } - } -#endif - -#if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) - template< class T, unsigned N > - inline std::size_t hash_value(const T (&x)[N]) - { - return hash_range(x, x + N); - } - - template< class T, unsigned N > - inline std::size_t hash_value(T (&x)[N]) - { - return hash_range(x, x + N); - } -#endif - - template <class Ch, class A> - inline std::size_t hash_value( - std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const& v) - { - return hash_range(v.begin(), v.end()); - } - - template <typename T> - typename boost::hash_detail::float_numbers<T>::type hash_value(T v) - { - return boost::hash_detail::float_hash_value(v); - } - -#if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX) - inline std::size_t hash_value(std::type_index v) - { - return v.hash_code(); - } -#endif - - // - // boost::hash - // - - // Define the specializations required by the standard. The general purpose - // boost::hash is defined later in extensions.hpp if - // BOOST_HASH_NO_EXTENSIONS is not defined. - - // BOOST_HASH_SPECIALIZE - define a specialization for a type which is - // passed by copy. - // - // BOOST_HASH_SPECIALIZE_REF - define a specialization for a type which is - // passed by const reference. - // - // These are undefined later. - -#define BOOST_HASH_SPECIALIZE(type) \ - template <> struct hash<type> \ - : public boost::hash_detail::hash_base<type> \ - { \ - std::size_t operator()(type v) const \ - { \ - return boost::hash_value(v); \ - } \ - }; - -#define BOOST_HASH_SPECIALIZE_REF(type) \ - template <> struct hash<type> \ - : public boost::hash_detail::hash_base<type> \ - { \ - std::size_t operator()(type const& v) const \ - { \ - return boost::hash_value(v); \ - } \ - }; - - BOOST_HASH_SPECIALIZE(bool) - BOOST_HASH_SPECIALIZE(char) - BOOST_HASH_SPECIALIZE(signed char) - BOOST_HASH_SPECIALIZE(unsigned char) -#if !defined(BOOST_NO_INTRINSIC_WCHAR_T) - BOOST_HASH_SPECIALIZE(wchar_t) -#endif -#if !defined(BOOST_NO_CXX11_CHAR16_T) - BOOST_HASH_SPECIALIZE(char16_t) -#endif -#if !defined(BOOST_NO_CXX11_CHAR32_T) - BOOST_HASH_SPECIALIZE(char32_t) -#endif - BOOST_HASH_SPECIALIZE(short) - BOOST_HASH_SPECIALIZE(unsigned short) - BOOST_HASH_SPECIALIZE(int) - BOOST_HASH_SPECIALIZE(unsigned int) - BOOST_HASH_SPECIALIZE(long) - BOOST_HASH_SPECIALIZE(unsigned long) - - BOOST_HASH_SPECIALIZE(float) - BOOST_HASH_SPECIALIZE(double) - BOOST_HASH_SPECIALIZE(long double) - - BOOST_HASH_SPECIALIZE_REF(std::string) -#if !defined(BOOST_NO_STD_WSTRING) && !defined(BOOST_NO_INTRINSIC_WCHAR_T) - BOOST_HASH_SPECIALIZE_REF(std::wstring) -#endif -#if !defined(BOOST_NO_CXX11_CHAR16_T) - BOOST_HASH_SPECIALIZE_REF(std::basic_string<char16_t>) -#endif -#if !defined(BOOST_NO_CXX11_CHAR32_T) - BOOST_HASH_SPECIALIZE_REF(std::basic_string<char32_t>) -#endif - -#if !defined(BOOST_NO_LONG_LONG) - BOOST_HASH_SPECIALIZE(boost::long_long_type) - BOOST_HASH_SPECIALIZE(boost::ulong_long_type) -#endif - -#if defined(BOOST_HAS_INT128) - BOOST_HASH_SPECIALIZE(boost::int128_type) - BOOST_HASH_SPECIALIZE(boost::uint128_type) -#endif - -#if !defined(BOOST_NO_CXX11_HDR_TYPEINDEX) - BOOST_HASH_SPECIALIZE(std::type_index) -#endif - -#undef BOOST_HASH_SPECIALIZE -#undef BOOST_HASH_SPECIALIZE_REF - -// Specializing boost::hash for pointers. - -#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) - - template <class T> - struct hash<T*> - : public boost::hash_detail::hash_base<T*> - { - std::size_t operator()(T* v) const - { -#if !BOOST_WORKAROUND(__SUNPRO_CC, <= 0x590) - return boost::hash_value(v); -#else - std::size_t x = static_cast<std::size_t>( - reinterpret_cast<std::ptrdiff_t>(v)); - - return x + (x >> 3); -#endif - } - }; - -#else - - // For compilers without partial specialization, we define a - // boost::hash for all remaining types. But hash_impl is only defined - // for pointers in 'extensions.hpp' - so when BOOST_HASH_NO_EXTENSIONS - // is defined there will still be a compile error for types not supported - // in the standard. - - namespace hash_detail - { - template <bool IsPointer> - struct hash_impl; - - template <> - struct hash_impl<true> - { - template <class T> - struct inner - : public boost::hash_detail::hash_base<T> - { - std::size_t operator()(T val) const - { -#if !BOOST_WORKAROUND(__SUNPRO_CC, <= 590) - return boost::hash_value(val); -#else - std::size_t x = static_cast<std::size_t>( - reinterpret_cast<std::ptrdiff_t>(val)); - - return x + (x >> 3); -#endif - } - }; - }; - } - - template <class T> struct hash - : public boost::hash_detail::hash_impl<boost::is_pointer<T>::value> - ::BOOST_NESTED_TEMPLATE inner<T> - { - }; - -#endif -} - -#undef BOOST_HASH_CHAR_TRAITS -#undef BOOST_FUNCTIONAL_HASH_ROTL32 - -#if defined(BOOST_MSVC) -#pragma warning(pop) -#endif - -#endif // BOOST_FUNCTIONAL_HASH_HASH_HPP - -// Include this outside of the include guards in case the file is included -// twice - once with BOOST_HASH_NO_EXTENSIONS defined, and then with it -// undefined. - -#if !defined(BOOST_HASH_NO_EXTENSIONS) \ - && !defined(BOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP) -#include <boost/functional/hash/extensions.hpp> -#endif +#include <boost/container_hash/hash.hpp> |