848 B
848 B
[pair.piecewise]
22 General utilities library [utilities]
22.3 Pairs [pairs]
22.3.5 Piecewise construction [pair.piecewise]
struct piecewise_construct_t { explicit piecewise_construct_t() = default; }; inline constexpr piecewise_construct_t piecewise_construct{};
The struct piecewise_construct_t is an empty class type used as a unique type to disambiguate constructor and function overloading.
Specifically,pair has a constructor with piecewise_construct_t as the first argument, immediately followed by two arguments used for piecewise construction of the elements of the pair object.