mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
#ifndef SPROUT_VARIANT_HASH_HPP
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#define SPROUT_VARIANT_HASH_HPP
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#include <cstddef>
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#include <sprout/config.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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//
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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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} // namespace std
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#endif // #ifndef SPROUT_VARIANT_HASH_HPP
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