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std::in_place_index

STD：在[医]地点，STD：：[医]位置[医]类型，性病：[医]位置[医]索引，STD：：in[医]位置[医]T，STD：：[医]位置[医]类型[医]T，STD：：[医]位置[医]指数[医]T型

Defined in header ​​
struct in_place_t { explicit in_place_t() = default; }; inline constexpr std::in_place_t in_place{};​(since C++17)
template <class T> struct in_place_type_t { explicit in_place_type_t() = default; }; template <class T> inline constexpr std::in_place_type_t<T> in_place_type{};​(since C++17)
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{};​(since C++17)

std::in_place，，，std::in_place_type，和std::in_place_index的构造函数可以传递的消歧标记。std::optional，，，std::variant，和std::any指示所包含的对象应该就地构造，对于后两个%29，则表示要构造的对象的类型为%28。

对应的类型/类型模板std::in_place_t，，，std::in_place_type_t和std::in_place_index_t可以在构造函数%27s参数列表中使用以匹配预期的标记。

另见

optional (since C++17)a wrapper that may or may not hold an object (class template)
variant (since C++17)a type-safe discriminated union (class template)
any (since C++17)Objects that hold instances of any CopyConstructible type. (class)

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