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support hash: pair, value_holder, optional, variant, tribool

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bolero-MURAKAMI 2013-02-04 10:24:23 +09:00
parent f3b405ad0f
commit 0a5f16ee81
18 changed files with 172 additions and 4 deletions
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36
sprout/variant/hash.hpp Normal file
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#ifndef SPROUT_VARIANT_HASH_HPP
#define SPROUT_VARIANT_HASH_HPP
#include <cstddef>
#include <sprout/config.hpp>
#include <sprout/functional/hash/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
#endif // #ifndef SPROUT_VARIANT_HASH_HPP