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std::experimental::parallel::sequential_execution_policy, std::experimental::parallel::parallel_execution_policy, std::experimental::parallel::parallel_vector_execution_policy

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class sequential_execution_policy { /* unspecified */ };
(parallelism TS)
class parallel_execution_policy { /* unspecified */ };
(parallelism TS)
class parallel_vector_execution_policy { /* unspecified */ };
(parallelism TS)

sequential_execution_policy, parallel_execution_policy and parallel_vector_execution_policy are tag types used to indicate the kinds of parallelism allowed in the execution of a parallel algorithm.