20 General utilities library [utilities]

20.10 Memory [memory]

20.10.11 Specialized algorithms [specialized.algorithms]

20.10.11.8 construct_­at [specialized.construct]

template<class T, class... Args> constexpr T* construct_at(T* location, Args&&... args); namespace ranges { template<class T, class... Args> constexpr T* construct_at(T* location, Args&&... args); }
Constraints: The expression ​::​new (declval<void*>()) T(declval<Args>()...) is well-formed when treated as an unevaluated operand.
Effects: Equivalent to:
return ::new (voidify(*location)) T(std::forward<Args>(args)...);