std::experimental::in_place
From cppreference.com
< cpp | experimental | optional
| Defined in header <experimental/optional>
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| constexpr in_place_t in_place{}; |
(library fundamentals TS) | |
std::experimental::in_place is a constant of type std::experimental::in_place_t that is 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.
See also
| in-place construction tag (tag) | |
| (C++17) |
a wrapper that may or may not hold an object (class template) |