std::in_place_t
From cppreference.com
| Defined in header <optional>
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| 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.
[edit] See also
| in-place construction tag (class template) | |
| (since C++17) |
a wrapper that may or may not hold an object (class template) |