mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2013 Bolero MURAKAMI
|
|
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_OPTIONAL_HASH_HPP
|
|
#define SPROUT_OPTIONAL_HASH_HPP
|
|
|
|
#include <cstddef>
|
|
#include <functional>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/optional/optional.hpp>
|
|
#include <sprout/functional/hash.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
|
|
|
|
namespace std {
|
|
#if defined(__clang__)
|
|
# pragma clang diagnostic push
|
|
# pragma clang diagnostic ignored "-Wmismatched-tags"
|
|
#endif
|
|
//
|
|
// hash
|
|
//
|
|
template<typename T>
|
|
struct hash<sprout::optional<T> >
|
|
: public sprout::hash<sprout::optional<T> >
|
|
{};
|
|
#if defined(__clang__)
|
|
# pragma clang diagnostic pop
|
|
#endif
|
|
} // namespace std
|
|
|
|
#endif // #ifndef SPROUT_OPTIONAL_HASH_HPP
|