22 General utilities library [utilities]

22.12 Execution policies [execpol]

22.12.8 Execution policy objects [execpol.objects]

inline constexpr execution::sequenced_policy execution::seq{ unspecified }; inline constexpr execution::parallel_policy execution::par{ unspecified }; inline constexpr execution::parallel_unsequenced_policy execution::par_unseq{ unspecified }; inline constexpr execution::unsequenced_policy execution::unseq{ unspecified };
The header <execution> declares global objects associated with each type of execution policy.