std::experimental::in_place_t
From cppreference.com
< cpp | experimental | optional
| Defined in header
<experimental/optional>
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| struct in_place_t {};
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(library fundamentals TS) | |
std::experimental::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
| (library fundamentals TS)
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an object of type std::experimental::in_place_t (function) |
| (library fundamentals TS)
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a wrapper that may or may not hold an object (class template) |