380 lines
11 KiB
C++
380 lines
11 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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// This implements the extensions to the standard.
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// It's undocumented, so you shouldn't use it....
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#if !defined(BOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP)
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#define BOOST_FUNCTIONAL_HASH_EXTENSIONS_HPP
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#include <boost/functional/hash/hash.hpp>
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#include <boost/detail/container_fwd.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/preprocessor/repetition/repeat_from_to.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#if !defined(BOOST_NO_CXX11_HDR_ARRAY)
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# include <array>
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#endif
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#if !defined(BOOST_NO_CXX11_HDR_TUPLE)
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# include <tuple>
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#endif
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#if !defined(BOOST_NO_CXX11_HDR_MEMORY)
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# include <memory>
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#endif
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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#if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
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#include <boost/type_traits/is_array.hpp>
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#endif
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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#include <boost/type_traits/is_const.hpp>
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#endif
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namespace boost
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{
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template <class A, class B>
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std::size_t hash_value(std::pair<A, B> const&);
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template <class T, class A>
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std::size_t hash_value(std::vector<T, A> const&);
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template <class T, class A>
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std::size_t hash_value(std::list<T, A> const& v);
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template <class T, class A>
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std::size_t hash_value(std::deque<T, A> const& v);
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template <class K, class C, class A>
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std::size_t hash_value(std::set<K, C, A> const& v);
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template <class K, class C, class A>
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std::size_t hash_value(std::multiset<K, C, A> const& v);
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template <class K, class T, class C, class A>
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std::size_t hash_value(std::map<K, T, C, A> const& v);
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template <class K, class T, class C, class A>
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std::size_t hash_value(std::multimap<K, T, C, A> const& v);
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template <class T>
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std::size_t hash_value(std::complex<T> const&);
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template <class A, class B>
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std::size_t hash_value(std::pair<A, B> const& v)
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{
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std::size_t seed = 0;
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boost::hash_combine(seed, v.first);
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boost::hash_combine(seed, v.second);
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return seed;
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}
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template <class T, class A>
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std::size_t hash_value(std::vector<T, A> const& v)
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{
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return boost::hash_range(v.begin(), v.end());
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}
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template <class T, class A>
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std::size_t hash_value(std::list<T, A> const& v)
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{
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return boost::hash_range(v.begin(), v.end());
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}
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template <class T, class A>
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std::size_t hash_value(std::deque<T, A> const& v)
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{
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return boost::hash_range(v.begin(), v.end());
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}
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template <class K, class C, class A>
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std::size_t hash_value(std::set<K, C, A> const& v)
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{
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return boost::hash_range(v.begin(), v.end());
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}
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template <class K, class C, class A>
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std::size_t hash_value(std::multiset<K, C, A> const& v)
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{
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return boost::hash_range(v.begin(), v.end());
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}
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template <class K, class T, class C, class A>
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std::size_t hash_value(std::map<K, T, C, A> const& v)
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{
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return boost::hash_range(v.begin(), v.end());
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}
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template <class K, class T, class C, class A>
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std::size_t hash_value(std::multimap<K, T, C, A> const& v)
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{
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return boost::hash_range(v.begin(), v.end());
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}
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template <class T>
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std::size_t hash_value(std::complex<T> const& v)
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{
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boost::hash<T> hasher;
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std::size_t seed = hasher(v.imag());
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seed ^= hasher(v.real()) + (seed<<6) + (seed>>2);
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return seed;
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}
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#if !defined(BOOST_NO_CXX11_HDR_ARRAY)
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template <class T, std::size_t N>
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std::size_t hash_value(std::array<T, N> const& v)
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{
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return boost::hash_range(v.begin(), v.end());
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}
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#endif
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#if !defined(BOOST_NO_CXX11_HDR_TUPLE)
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namespace hash_detail {
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template <std::size_t I, typename T>
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inline typename boost::enable_if_c<(I == std::tuple_size<T>::value),
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void>::type
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hash_combine_tuple(std::size_t&, T const&)
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{
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}
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template <std::size_t I, typename T>
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inline typename boost::enable_if_c<(I < std::tuple_size<T>::value),
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void>::type
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hash_combine_tuple(std::size_t& seed, T const& v)
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{
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boost::hash_combine(seed, std::get<I>(v));
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boost::hash_detail::hash_combine_tuple<I + 1>(seed, v);
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}
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template <typename T>
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inline std::size_t hash_tuple(T const& v)
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{
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std::size_t seed = 0;
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boost::hash_detail::hash_combine_tuple<0>(seed, v);
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return seed;
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}
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}
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#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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template <typename... T>
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inline std::size_t hash_value(std::tuple<T...> const& v)
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{
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return boost::hash_detail::hash_tuple(v);
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}
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#else
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inline std::size_t hash_value(std::tuple<> const& v)
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{
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return boost::hash_detail::hash_tuple(v);
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}
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# define BOOST_HASH_TUPLE_F(z, n, _) \
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template< \
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BOOST_PP_ENUM_PARAMS_Z(z, n, typename A) \
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> \
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inline std::size_t hash_value(std::tuple< \
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BOOST_PP_ENUM_PARAMS_Z(z, n, A) \
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> const& v) \
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{ \
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return boost::hash_detail::hash_tuple(v); \
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}
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BOOST_PP_REPEAT_FROM_TO(1, 11, BOOST_HASH_TUPLE_F, _)
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# undef BOOST_HASH_TUPLE_F
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#endif
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#endif
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#if !defined(BOOST_NO_CXX11_SMART_PTR)
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template <typename T>
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inline std::size_t hash_value(std::shared_ptr<T> const& x) {
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return boost::hash_value(x.get());
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}
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template <typename T, typename Deleter>
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inline std::size_t hash_value(std::unique_ptr<T, Deleter> const& x) {
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return boost::hash_value(x.get());
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}
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#endif
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//
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// call_hash_impl
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//
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// On compilers without function template ordering, this deals with arrays.
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#if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
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namespace hash_detail
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{
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template <bool IsArray>
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struct call_hash_impl
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{
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template <class T>
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struct inner
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{
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static std::size_t call(T const& v)
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{
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using namespace boost;
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return hash_value(v);
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}
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};
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};
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template <>
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struct call_hash_impl<true>
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{
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template <class Array>
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struct inner
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{
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#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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static std::size_t call(Array const& v)
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#else
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static std::size_t call(Array& v)
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#endif
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{
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const int size = sizeof(v) / sizeof(*v);
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return boost::hash_range(v, v + size);
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}
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};
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};
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template <class T>
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struct call_hash
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: public call_hash_impl<boost::is_array<T>::value>
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::BOOST_NESTED_TEMPLATE inner<T>
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{
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};
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}
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#endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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//
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// boost::hash
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//
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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template <class T> struct hash
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: std::unary_function<T, std::size_t>
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{
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#if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
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std::size_t operator()(T const& val) const
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{
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return hash_value(val);
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}
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#else
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std::size_t operator()(T const& val) const
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{
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return hash_detail::call_hash<T>::call(val);
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}
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#endif
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};
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#if BOOST_WORKAROUND(__DMC__, <= 0x848)
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template <class T, unsigned int n> struct hash<T[n]>
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: std::unary_function<T[n], std::size_t>
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{
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std::size_t operator()(const T* val) const
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{
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return boost::hash_range(val, val+n);
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}
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};
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#endif
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#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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// On compilers without partial specialization, boost::hash<T>
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// has already been declared to deal with pointers, so just
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// need to supply the non-pointer version of hash_impl.
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namespace hash_detail
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{
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template <bool IsPointer>
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struct hash_impl;
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#if !BOOST_WORKAROUND(BOOST_MSVC, < 1300)
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template <>
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struct hash_impl<false>
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{
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template <class T>
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struct inner
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: std::unary_function<T, std::size_t>
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{
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#if !defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
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std::size_t operator()(T const& val) const
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{
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return hash_value(val);
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}
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#else
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std::size_t operator()(T const& val) const
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{
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return hash_detail::call_hash<T>::call(val);
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}
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#endif
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};
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};
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#else // Visual C++ 6.5
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// Visual C++ 6.5 has problems with nested member functions and
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// applying const to const types in templates. So we get this:
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template <bool IsConst>
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struct hash_impl_msvc
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{
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template <class T>
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struct inner
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: public std::unary_function<T, std::size_t>
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{
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std::size_t operator()(T const& val) const
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{
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return hash_detail::call_hash<T const>::call(val);
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}
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std::size_t operator()(T& val) const
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{
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return hash_detail::call_hash<T>::call(val);
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}
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};
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};
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template <>
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struct hash_impl_msvc<true>
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{
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template <class T>
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struct inner
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: public std::unary_function<T, std::size_t>
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{
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std::size_t operator()(T& val) const
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{
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return hash_detail::call_hash<T>::call(val);
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}
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};
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};
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template <class T>
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struct hash_impl_msvc2
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: public hash_impl_msvc<boost::is_const<T>::value>
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::BOOST_NESTED_TEMPLATE inner<T> {};
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template <>
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struct hash_impl<false>
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{
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template <class T>
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struct inner : public hash_impl_msvc2<T> {};
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};
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#endif // Visual C++ 6.5
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}
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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}
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#endif
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