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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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22
sprout/optional/hash.hpp Normal file
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#ifndef SPROUT_OPTIONAL_HASH_HPP
#define SPROUT_OPTIONAL_HASH_HPP
#include <cstddef>
#include <sprout/config.hpp>
#include <sprout/functional/hash/hash.hpp>
#include <sprout/optional/optional.hpp>
namespace sprout {
//
// hash_value
//
template<typename T>
inline SPROUT_CONSTEXPR std::size_t
hash_value(sprout::optional<T> const& v) {
return v.is_initialized() ? sprout::to_hash(*v)
: 0
;
}
} // namespace sprout
#endif // #ifndef SPROUT_OPTIONAL_HASH_HPP