26 Algorithms library [algorithms]

26.3 Parallel algorithms [algorithms.parallel]

26.3.6 Execution policies [execpol]

26.3.6.7 Execution policy objects [execpol.objects]

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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 };
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The header <execution> declares global objects associated with each type of execution policy.