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Sprout/sprout/utility/value_holder/hash.hpp

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/*=============================================================================
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Copyright (c) 2011-2015 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_UTILITY_VALUE_HOLDER_HASH_HPP
#define SPROUT_UTILITY_VALUE_HOLDER_HASH_HPP
#include <functional>
#include <sprout/config.hpp>
#include <sprout/workaround/std/cstddef.hpp>
#include <sprout/utility/value_holder/value_holder.hpp>
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#include <sprout/functional/hash.hpp>
namespace sprout {
//
// hash_value
//
template<typename T>
inline SPROUT_CONSTEXPR std::size_t
hash_value(sprout::value_holder<T> const& v) {
return sprout::to_hash(*v)
;
}
template<typename T>
inline SPROUT_CONSTEXPR std::size_t
hash_value(sprout::value_holder<T&> const& v) {
return v.is_initialized() ? sprout::to_hash(*v)
: 0
;
}
} // namespace sprout
namespace std {
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#if defined(__clang__)
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wmismatched-tags"
#endif
//
// hash
//
template<typename T>
struct hash<sprout::value_holder<T> >
: public sprout::hash<sprout::value_holder<T> >
{};
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#if defined(__clang__)
# pragma clang diagnostic pop
#endif
} // namespace std
#endif // #ifndef SPROUT_UTILITY_VALUE_HOLDER_HASH_HPP