class T1,
class T2
std::pair is a class template that provides a way to store two heterogeneous objects as a single unit. A pair is a specific case of a std::tuple with two elements.
If neither T1 nor T2 is a possibly cv-qualified class type with non-trivial destructor, or array thereof, the destructor of pair is trivial.
first_type T1 second_type T2 [edit] Member objects Member name Type first T1 second T2 [edit] Member functions [edit] Non-member functions [edit] Helper classes [edit] Helper specializations template< class T, class U >
constexpr bool enable_nonlocking_formatter_optimization<std::pair<T, U>> =
enable_nonlocking_formatter_optimization<T> &&
This specialization of std::enable_nonlocking_formatter_optimization enables efficient implementation of std::print and std::println for printing a pair object when both T and U enable it.
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 2796 C++98 triviality of the destructor ofpair was unspecified specified [edit] See also implements fixed size container, which holds elements of possibly different types
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