in_place_t Struct

Syntax

struct in_place_t {
    explicit in_place_t() = default;
};

inline constexpr in_place_t in_place{};

template <class T>
    struct in_place_type_t {
        explicit in_place_type_t() = default;
    };

template <class T> inline constexpr in_place_type_t<T> in_place_type{};

template <size_t I>
    struct in_place_index_t {
        explicit in_place_index_t() = default;
    };

template <size_t I> inline constexpr in_place_index_t<I> in_place_index{};