// 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. | |
#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> | |
#if defined(BOOST_HASH_NO_IMPLICIT_CASTS) | |
#include <boost/static_assert.hpp> | |
#endif | |
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) | |
#include <boost/type_traits/is_pointer.hpp> | |
#endif | |
#if !defined(BOOST_NO_0X_HDR_TYPEINDEX) | |
#include <typeindex> | |
#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 | |
namespace boost | |
{ | |
#if defined(BOOST_HASH_NO_IMPLICIT_CASTS) | |
// If you get a static assertion here, it's because hash_value | |
// isn't declared for your type. | |
template <typename T> | |
std::size_t hash_value(T const&) { | |
BOOST_STATIC_ASSERT((T*) 0 && false); | |
return 0; | |
} | |
#endif | |
std::size_t hash_value(bool); | |
std::size_t hash_value(char); | |
std::size_t hash_value(unsigned char); | |
std::size_t hash_value(signed char); | |
std::size_t hash_value(short); | |
std::size_t hash_value(unsigned short); | |
std::size_t hash_value(int); | |
std::size_t hash_value(unsigned int); | |
std::size_t hash_value(long); | |
std::size_t hash_value(unsigned long); | |
#if !defined(BOOST_NO_INTRINSIC_WCHAR_T) | |
std::size_t hash_value(wchar_t); | |
#endif | |
#if !defined(BOOST_NO_LONG_LONG) | |
std::size_t hash_value(boost::long_long_type); | |
std::size_t hash_value(boost::ulong_long_type); | |
#endif | |
#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 | |
std::size_t hash_value(float v); | |
std::size_t hash_value(double v); | |
std::size_t hash_value(long double v); | |
template <class Ch, class A> | |
std::size_t hash_value( | |
std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const&); | |
#if !defined(BOOST_NO_0X_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 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) | |
/ 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 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) | |
/ 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; | |
} | |
} | |
inline std::size_t hash_value(bool v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
inline std::size_t hash_value(char v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
inline std::size_t hash_value(unsigned char v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
inline std::size_t hash_value(signed char v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
inline std::size_t hash_value(short v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
inline std::size_t hash_value(unsigned short v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
inline std::size_t hash_value(int v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
inline std::size_t hash_value(unsigned int v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
inline std::size_t hash_value(long v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
inline std::size_t hash_value(unsigned long v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
#if !defined(BOOST_NO_INTRINSIC_WCHAR_T) | |
inline std::size_t hash_value(wchar_t v) | |
{ | |
return static_cast<std::size_t>(v); | |
} | |
#endif | |
#if !defined(BOOST_NO_LONG_LONG) | |
inline std::size_t hash_value(boost::long_long_type v) | |
{ | |
return hash_detail::hash_value_signed(v); | |
} | |
inline std::size_t hash_value(boost::ulong_long_type v) | |
{ | |
return hash_detail::hash_value_unsigned(v); | |
} | |
#endif | |
// 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 | |
#if BOOST_WORKAROUND(BOOST_MSVC, < 1300) | |
template <class T> | |
inline void hash_combine(std::size_t& seed, T& v) | |
#else | |
template <class T> | |
inline void hash_combine(std::size_t& seed, T const& v) | |
#endif | |
{ | |
boost::hash<T> hasher; | |
seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2); | |
} | |
#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()); | |
} | |
inline std::size_t hash_value(float v) | |
{ | |
return boost::hash_detail::float_hash_value(v); | |
} | |
inline std::size_t hash_value(double v) | |
{ | |
return boost::hash_detail::float_hash_value(v); | |
} | |
inline std::size_t hash_value(long double v) | |
{ | |
return boost::hash_detail::float_hash_value(v); | |
} | |
#if !defined(BOOST_NO_0X_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 copy. | |
// | |
// These are undefined later. | |
#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) | |
#define BOOST_HASH_SPECIALIZE(type) \ | |
template <> struct hash<type> \ | |
: public std::unary_function<type, std::size_t> \ | |
{ \ | |
std::size_t operator()(type v) const \ | |
{ \ | |
return boost::hash_value(v); \ | |
} \ | |
}; | |
#define BOOST_HASH_SPECIALIZE_REF(type) \ | |
template <> struct hash<type> \ | |
: public std::unary_function<type, std::size_t> \ | |
{ \ | |
std::size_t operator()(type const& v) const \ | |
{ \ | |
return boost::hash_value(v); \ | |
} \ | |
}; | |
#else | |
#define BOOST_HASH_SPECIALIZE(type) \ | |
template <> struct hash<type> \ | |
: public std::unary_function<type, std::size_t> \ | |
{ \ | |
std::size_t operator()(type v) const \ | |
{ \ | |
return boost::hash_value(v); \ | |
} \ | |
}; \ | |
\ | |
template <> struct hash<const type> \ | |
: public std::unary_function<const type, std::size_t> \ | |
{ \ | |
std::size_t operator()(const type v) const \ | |
{ \ | |
return boost::hash_value(v); \ | |
} \ | |
}; | |
#define BOOST_HASH_SPECIALIZE_REF(type) \ | |
template <> struct hash<type> \ | |
: public std::unary_function<type, std::size_t> \ | |
{ \ | |
std::size_t operator()(type const& v) const \ | |
{ \ | |
return boost::hash_value(v); \ | |
} \ | |
}; \ | |
\ | |
template <> struct hash<const type> \ | |
: public std::unary_function<const type, std::size_t> \ | |
{ \ | |
std::size_t operator()(type const& v) const \ | |
{ \ | |
return boost::hash_value(v); \ | |
} \ | |
}; | |
#endif | |
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 | |
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) | |
BOOST_HASH_SPECIALIZE_REF(std::wstring) | |
#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_NO_0X_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 std::unary_function<T*, std::size_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 std::unary_function<T, std::size_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 | |
#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 |