in_place.hpp

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# /*
#  * Created by YongGyu Lee on 2021/05/23.
#  */
#
# ifndef VCCC_UTILITY_IN_PLACE_HPP
# define VCCC_UTILITY_IN_PLACE_HPP
#
# include <cstddef>
#if __cplusplus >= 201703L
# include <utility>
#endif
#
# include "vccc/__core/inline_or_static.hpp"
 
namespace vccc {
 
 
#if __cplusplus < 201703L
 
struct in_place_t {
  constexpr explicit in_place_t() = default;
};
 
template<typename T>
struct in_place_type_t {
  constexpr explicit in_place_type_t() = default;
};
 
template<std::size_t I>
struct in_place_index_t {
  constexpr explicit in_place_index_t() = default;
};
 
#else
 
using in_place_t = std::in_place_t;
template<typename T> using in_place_type_t = std::in_place_type_t<T>;
template<std::size_t I> using in_place_index_t = std::in_place_index_t<I>;
 
#endif
 
VCCC_INLINE_OR_STATIC constexpr in_place_t in_place{};
 
template<typename T>
VCCC_INLINE_OR_STATIC constexpr in_place_type_t<T> in_place_type{};
 
template<std::size_t I>
VCCC_INLINE_OR_STATIC constexpr in_place_index_t<I> in_place_index{};
 
 
} // namespace vccc
 
# endif // VCCC_UTILITY_IN_PLACE_HPP