mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-25 00:43:44 +00:00
61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2019 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
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)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_VARIANT_HASH_HPP
|
|
#define SPROUT_VARIANT_HASH_HPP
|
|
|
|
#include <functional>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/workaround/std/cstddef.hpp>
|
|
#include <sprout/functional/hash.hpp>
|
|
#include <sprout/variant/variant.hpp>
|
|
#include <sprout/variant/static_visitor.hpp>
|
|
#include <sprout/variant/apply_visitor.hpp>
|
|
|
|
namespace sprout {
|
|
namespace detail {
|
|
class variant_hash_visitor
|
|
: public sprout::static_visitor<std::size_t>
|
|
{
|
|
public:
|
|
template<typename T>
|
|
SPROUT_CONSTEXPR std::size_t operator()(T const& t) const {
|
|
return sprout::to_hash(t);
|
|
}
|
|
};
|
|
} // namespace detail
|
|
//
|
|
// hash_value
|
|
//
|
|
template<typename... Types>
|
|
inline SPROUT_CONSTEXPR std::size_t
|
|
hash_value(sprout::variant<Types...> const& v) {
|
|
return sprout::hash_combine(
|
|
sprout::apply_visitor(sprout::detail::variant_hash_visitor(), v),
|
|
v.which()
|
|
);
|
|
}
|
|
} // namespace sprout
|
|
|
|
namespace std {
|
|
#if defined(__clang__)
|
|
# pragma clang diagnostic push
|
|
# pragma clang diagnostic ignored "-Wmismatched-tags"
|
|
#endif
|
|
//
|
|
// hash
|
|
//
|
|
template<typename... Types>
|
|
struct hash<sprout::variant<Types...> >
|
|
: public sprout::hash<sprout::variant<Types...> >
|
|
{};
|
|
#if defined(__clang__)
|
|
# pragma clang diagnostic pop
|
|
#endif
|
|
} // namespace std
|
|
|
|
#endif // #ifndef SPROUT_VARIANT_HASH_HPP
|