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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../utility/in_place.html below:

std::in_place, std::in_place_type, std::in_place_index, std::in_place_t, std::in_place_type_t, std::in_place_index_t

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

(1) (since C++17)

inline constexpr std::in_place_t in_place {};

(2) (since C++17)

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

(3) (since C++17)

template< class T >
constexpr std::in_place_type_t<T> in_place_type {};

(4) (since C++17) template< std::size_t I >
struct in_place_index_t { explicit in_place_index_t() = default; }; (5) (since C++17) template< std::size_t I >
constexpr std::in_place_index_t<I> in_place_index {}; (6) (since C++17)

1,3,5) The type/type templates std::in_place_t, std::in_place_type_t and std::in_place_index_t can be used in the constructor's parameter list to match the intended tag.

2,4,6) The corresponding std::in_place, std::in_place_type, and std::in_place_index instances of (1,3,5) are disambiguation tags that can be passed to the constructors to indicate that the contained object should be constructed in-place, and (for the latter two) the type of the object to be constructed.

[edit] Standard library

The following standard library types use (1-6) as disambiguation tags:

objects that hold instances of any CopyConstructible type
(class) [edit] a wrapper that contains either an expected or error value
(class template) [edit] move-only wrapper of any callable object that supports qualifiers in a given call signature
(class template) [edit] a wrapper that may or may not hold an object
(class template) [edit] a type-safe discriminated union
(class template) [edit] [edit] See also

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