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https://github.com/bolero-MURAKAMI/Sprout.git
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33 lines
686 B
C++
33 lines
686 B
C++
#ifndef SPROUT_OPTIONAL_HASH_HPP
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#define SPROUT_OPTIONAL_HASH_HPP
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#include <cstddef>
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#include <functional>
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#include <sprout/config.hpp>
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#include <sprout/optional/optional.hpp>
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#include <sprout/functional/hash.hpp>
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namespace sprout {
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//
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// hash_value
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//
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template<typename T>
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inline SPROUT_CONSTEXPR std::size_t
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hash_value(sprout::optional<T> const& v) {
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return v.is_initialized() ? sprout::to_hash(*v)
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: 0
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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 T>
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struct hash<sprout::optional<T> >
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: public sprout::hash<sprout::optional<T> >
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{};
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} // namespace std
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#endif // #ifndef SPROUT_OPTIONAL_HASH_HPP
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