hash.h

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# /*
#  * Created by YongGyu Lee on 2021/05/25.
#  */
#
# ifndef VCCC_OPTIONAL_INTERNAL_HASH_H_
# define VCCC_OPTIONAL_INTERNAL_HASH_H_
#
# include <functional>
# include <type_traits>
 
namespace vccc {
namespace internal {
namespace optional {
 
struct not_constructible {
  not_constructible() = delete;
};
 
struct constructible {};
 
template<typename T>
using hash_constructible =
std::conditional_t<
  std::is_default_constructible<std::hash<T>>::value,
  constructible,
  not_constructible>;
 
} // namespace optional
} // namespace internal
} // namespace vccc
 
# endif // VCCC_OPTIONAL_INTERNAL_HASH_H_