598bfd3f
 Hu Chunming
提交_GLIBCXX_USE_CX...
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/*!
@file
Defines `boost::hana::hash`.
Copyright Jason Rice 2016
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_HASH_HPP
#define BOOST_HANA_HASH_HPP
#include <boost/hana/fwd/hash.hpp>
#include <boost/hana/concept/hashable.hpp>
#include <boost/hana/concept/integral_constant.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/fwd/integral_constant.hpp>
#include <boost/hana/type.hpp>
#include <type_traits>
namespace boost { namespace hana {
//! @cond
template <typename X>
constexpr auto hash_t::operator()(X const& x) const {
using Tag = typename hana::tag_of<X>::type;
using Hash = BOOST_HANA_DISPATCH_IF(hash_impl<Tag>,
hana::Hashable<Tag>::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Hashable<Tag>::value,
"hana::hash(x) requires 'x' to be Hashable");
#endif
return Hash::apply(x);
}
//! @endcond
template <typename Tag, bool condition>
struct hash_impl<Tag, when<condition>> : default_ {
template <typename X>
static constexpr auto apply(X const&) = delete;
};
namespace detail {
template <typename T, typename = void>
struct hash_integral_helper;
template <typename Member, typename T>
struct hash_integral_helper<Member T::*> {
template <typename X>
static constexpr auto apply(X const&) {
return hana::type_c<hana::integral_constant<Member T::*, X::value>>;
}
};
template <typename T>
struct hash_integral_helper<T,
typename std::enable_if<std::is_signed<T>::value>::type
> {
template <typename X>
static constexpr auto apply(X const&) {
constexpr signed long long x = X::value;
return hana::type_c<hana::integral_constant<signed long long, x>>;
}
};
template <typename T>
struct hash_integral_helper<T,
typename std::enable_if<std::is_unsigned<T>::value>::type
> {
template <typename X>
static constexpr auto apply(X const&) {
constexpr unsigned long long x = X::value;
return hana::type_c<hana::integral_constant<unsigned long long, x>>;
}
};
template <>
struct hash_integral_helper<bool> {
template <typename X>
static constexpr auto apply(X const&) {
return hana::type_c<hana::integral_constant<bool, X::value>>;
}
};
template <>
struct hash_integral_helper<char> {
template <typename X>
static constexpr auto apply(X const&) {
using T = std::conditional<std::is_signed<char>::value,
signed long long, unsigned long long
>::type;
constexpr T x = X::value;
return hana::type_c<hana::integral_constant<T, x>>;
}
};
}
template <typename Tag>
struct hash_impl<Tag, when<hana::IntegralConstant<Tag>::value>> {
template <typename X>
static constexpr auto apply(X const& x) {
using T = typename std::remove_cv<decltype(X::value)>::type;
return detail::hash_integral_helper<T>::apply(x);
}
};
}} // end namespace boost::hana
#endif // !BOOST_HANA_HASH_HPP
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