537 lines
14 KiB
C++
537 lines
14 KiB
C++
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// Copyright 2005-2009 Daniel James.
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// Based on Peter Dimov's proposal
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// http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1756.pdf
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// issue 6.18.
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#if !defined(BOOST_FUNCTIONAL_HASH_HASH_HPP)
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#define BOOST_FUNCTIONAL_HASH_HASH_HPP
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#include <boost/functional/hash/hash_fwd.hpp>
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#include <functional>
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#include <boost/functional/hash/detail/hash_float.hpp>
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#include <string>
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#include <boost/limits.hpp>
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#if defined(BOOST_HASH_NO_IMPLICIT_CASTS)
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#include <boost/static_assert.hpp>
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#endif
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#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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#include <boost/type_traits/is_pointer.hpp>
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#endif
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#if !defined(BOOST_NO_0X_HDR_TYPEINDEX)
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#include <typeindex>
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#endif
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#if BOOST_WORKAROUND(__GNUC__, < 3) \
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&& !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
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#define BOOST_HASH_CHAR_TRAITS string_char_traits
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#else
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#define BOOST_HASH_CHAR_TRAITS char_traits
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#endif
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namespace boost
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{
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#if defined(BOOST_HASH_NO_IMPLICIT_CASTS)
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// If you get a static assertion here, it's because hash_value
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// isn't declared for your type.
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template <typename T>
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std::size_t hash_value(T const&) {
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BOOST_STATIC_ASSERT((T*) 0 && false);
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return 0;
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}
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#endif
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std::size_t hash_value(bool);
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std::size_t hash_value(char);
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std::size_t hash_value(unsigned char);
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std::size_t hash_value(signed char);
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std::size_t hash_value(short);
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std::size_t hash_value(unsigned short);
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std::size_t hash_value(int);
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std::size_t hash_value(unsigned int);
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std::size_t hash_value(long);
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std::size_t hash_value(unsigned long);
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#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
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std::size_t hash_value(wchar_t);
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#endif
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#if !defined(BOOST_NO_LONG_LONG)
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std::size_t hash_value(boost::long_long_type);
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std::size_t hash_value(boost::ulong_long_type);
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#endif
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#if !BOOST_WORKAROUND(__DMC__, <= 0x848)
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template <class T> std::size_t hash_value(T* const&);
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#else
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template <class T> std::size_t hash_value(T*);
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#endif
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#if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
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template< class T, unsigned N >
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std::size_t hash_value(const T (&x)[N]);
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template< class T, unsigned N >
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std::size_t hash_value(T (&x)[N]);
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#endif
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std::size_t hash_value(float v);
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std::size_t hash_value(double v);
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std::size_t hash_value(long double v);
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template <class Ch, class A>
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std::size_t hash_value(
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std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const&);
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#if !defined(BOOST_NO_0X_HDR_TYPEINDEX)
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std::size_t hash_value(std::type_index);
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#endif
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// Implementation
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namespace hash_detail
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{
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template <class T>
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inline std::size_t hash_value_signed(T val)
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{
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const int size_t_bits = std::numeric_limits<std::size_t>::digits;
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// ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1
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const int length = (std::numeric_limits<T>::digits - 1)
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/ size_t_bits;
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std::size_t seed = 0;
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T positive = val < 0 ? -1 - val : val;
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// Hopefully, this loop can be unrolled.
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for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits)
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{
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seed ^= (std::size_t) (positive >> i) + (seed<<6) + (seed>>2);
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}
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seed ^= (std::size_t) val + (seed<<6) + (seed>>2);
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return seed;
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}
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template <class T>
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inline std::size_t hash_value_unsigned(T val)
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{
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const int size_t_bits = std::numeric_limits<std::size_t>::digits;
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// ceiling(std::numeric_limits<T>::digits / size_t_bits) - 1
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const int length = (std::numeric_limits<T>::digits - 1)
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/ size_t_bits;
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std::size_t seed = 0;
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// Hopefully, this loop can be unrolled.
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for(unsigned int i = length * size_t_bits; i > 0; i -= size_t_bits)
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{
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seed ^= (std::size_t) (val >> i) + (seed<<6) + (seed>>2);
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}
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seed ^= (std::size_t) val + (seed<<6) + (seed>>2);
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return seed;
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}
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}
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inline std::size_t hash_value(bool v)
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{
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return static_cast<std::size_t>(v);
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}
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inline std::size_t hash_value(char v)
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{
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return static_cast<std::size_t>(v);
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}
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inline std::size_t hash_value(unsigned char v)
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{
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return static_cast<std::size_t>(v);
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}
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inline std::size_t hash_value(signed char v)
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{
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return static_cast<std::size_t>(v);
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}
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inline std::size_t hash_value(short v)
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{
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return static_cast<std::size_t>(v);
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}
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inline std::size_t hash_value(unsigned short v)
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{
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return static_cast<std::size_t>(v);
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}
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inline std::size_t hash_value(int v)
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{
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return static_cast<std::size_t>(v);
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}
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inline std::size_t hash_value(unsigned int v)
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{
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return static_cast<std::size_t>(v);
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}
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inline std::size_t hash_value(long v)
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{
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return static_cast<std::size_t>(v);
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}
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inline std::size_t hash_value(unsigned long v)
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{
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return static_cast<std::size_t>(v);
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}
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#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
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inline std::size_t hash_value(wchar_t v)
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{
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return static_cast<std::size_t>(v);
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}
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#endif
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#if !defined(BOOST_NO_LONG_LONG)
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inline std::size_t hash_value(boost::long_long_type v)
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{
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return hash_detail::hash_value_signed(v);
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}
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inline std::size_t hash_value(boost::ulong_long_type v)
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{
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return hash_detail::hash_value_unsigned(v);
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}
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#endif
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// Implementation by Alberto Barbati and Dave Harris.
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#if !BOOST_WORKAROUND(__DMC__, <= 0x848)
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template <class T> std::size_t hash_value(T* const& v)
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#else
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template <class T> std::size_t hash_value(T* v)
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#endif
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{
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#if defined(__VMS) && __INITIAL_POINTER_SIZE == 64
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// for some reason ptrdiff_t on OpenVMS compiler with
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// 64 bit is not 64 bit !!!
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std::size_t x = static_cast<std::size_t>(
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reinterpret_cast<long long int>(v));
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#else
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std::size_t x = static_cast<std::size_t>(
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reinterpret_cast<std::ptrdiff_t>(v));
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#endif
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return x + (x >> 3);
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}
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#if defined(BOOST_MSVC)
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#pragma warning(push)
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#if BOOST_MSVC <= 1400
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#pragma warning(disable:4267) // 'argument' : conversion from 'size_t' to
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// 'unsigned int', possible loss of data
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// A misguided attempt to detect 64-bit
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// incompatability.
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#endif
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#endif
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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template <class T>
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inline void hash_combine(std::size_t& seed, T& v)
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#else
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template <class T>
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inline void hash_combine(std::size_t& seed, T const& v)
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#endif
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{
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boost::hash<T> hasher;
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seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2);
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}
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#if defined(BOOST_MSVC)
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#pragma warning(pop)
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#endif
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template <class It>
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inline std::size_t hash_range(It first, It last)
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{
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std::size_t seed = 0;
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for(; first != last; ++first)
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{
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hash_combine(seed, *first);
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}
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return seed;
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}
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template <class It>
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inline void hash_range(std::size_t& seed, It first, It last)
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{
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for(; first != last; ++first)
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{
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hash_combine(seed, *first);
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}
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}
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#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
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template <class T>
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inline std::size_t hash_range(T* first, T* last)
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{
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std::size_t seed = 0;
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for(; first != last; ++first)
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{
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boost::hash<T> hasher;
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seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2);
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}
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return seed;
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}
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template <class T>
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inline void hash_range(std::size_t& seed, T* first, T* last)
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{
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for(; first != last; ++first)
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{
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boost::hash<T> hasher;
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seed ^= hasher(*first) + 0x9e3779b9 + (seed<<6) + (seed>>2);
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}
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}
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#endif
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#if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
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template< class T, unsigned N >
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inline std::size_t hash_value(const T (&x)[N])
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{
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return hash_range(x, x + N);
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}
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template< class T, unsigned N >
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inline std::size_t hash_value(T (&x)[N])
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{
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return hash_range(x, x + N);
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}
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#endif
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template <class Ch, class A>
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inline std::size_t hash_value(
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std::basic_string<Ch, std::BOOST_HASH_CHAR_TRAITS<Ch>, A> const& v)
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{
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return hash_range(v.begin(), v.end());
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}
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inline std::size_t hash_value(float v)
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{
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return boost::hash_detail::float_hash_value(v);
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}
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inline std::size_t hash_value(double v)
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{
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return boost::hash_detail::float_hash_value(v);
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}
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inline std::size_t hash_value(long double v)
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{
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return boost::hash_detail::float_hash_value(v);
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}
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#if !defined(BOOST_NO_0X_HDR_TYPEINDEX)
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inline std::size_t hash_value(std::type_index v)
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{
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return v.hash_code();
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}
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#endif
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//
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// boost::hash
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//
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// Define the specializations required by the standard. The general purpose
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// boost::hash is defined later in extensions.hpp if
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// BOOST_HASH_NO_EXTENSIONS is not defined.
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// BOOST_HASH_SPECIALIZE - define a specialization for a type which is
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// passed by copy.
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//
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// BOOST_HASH_SPECIALIZE_REF - define a specialization for a type which is
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// passed by copy.
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//
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// These are undefined later.
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#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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#define BOOST_HASH_SPECIALIZE(type) \
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template <> struct hash<type> \
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: public std::unary_function<type, std::size_t> \
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{ \
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std::size_t operator()(type v) const \
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{ \
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return boost::hash_value(v); \
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} \
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};
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#define BOOST_HASH_SPECIALIZE_REF(type) \
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template <> struct hash<type> \
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: public std::unary_function<type, std::size_t> \
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{ \
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std::size_t operator()(type const& v) const \
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{ \
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return boost::hash_value(v); \
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} \
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|
};
|
||
|
|
#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
|