mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2015 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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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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=============================================================================*/
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#ifndef SPROUT_VARIANT_HASH_HPP
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#define SPROUT_VARIANT_HASH_HPP
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#include <functional>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/functional/hash.hpp>
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#include <sprout/variant/variant.hpp>
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#include <sprout/variant/static_visitor.hpp>
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#include <sprout/variant/apply_visitor.hpp>
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namespace sprout {
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namespace detail {
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class variant_hash_visitor
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: public sprout::static_visitor<std::size_t>
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{
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public:
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template<typename T>
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SPROUT_CONSTEXPR std::size_t operator()(T const& t) const {
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return sprout::to_hash(t);
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}
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};
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} // namespace detail
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//
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// hash_value
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//
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template<typename... Types>
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inline SPROUT_CONSTEXPR std::size_t
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hash_value(sprout::variant<Types...> const& v) {
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return sprout::hash_combine(
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sprout::apply_visitor(sprout::detail::variant_hash_visitor(), v),
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v.which()
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);
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}
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} // namespace sprout
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namespace std {
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#if defined(__clang__)
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# pragma clang diagnostic push
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# pragma clang diagnostic ignored "-Wmismatched-tags"
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#endif
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//
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// hash
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//
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template<typename... Types>
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struct hash<sprout::variant<Types...> >
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: public sprout::hash<sprout::variant<Types...> >
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{};
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#if defined(__clang__)
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# pragma clang diagnostic pop
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#endif
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} // namespace std
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#endif // #ifndef SPROUT_VARIANT_HASH_HPP
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