Defined in header <optional> | ||
|---|---|---|
struct in_place_t {};
| (since C++17) |
std::in_place_t is an empty class type used to disambiguate the overloads of constructors and member functions of that take arguments (possibly a parameter pack) for in-place construction of some value.
|
(C++17) | in-place construction tag (class template) |
|
(since C++17) | a wrapper that may or may not hold an object (class template) |
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