std::experimental::parallel::seq, std::experimental::parallel::par, std::experimental::parallel::par_vec
From cppreference.com
< cpp | experimental
| Defined in header <experimental/execution_policy>
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| constexpr sequential_execution_policy seq{}; |
(parallelism TS) | |
| constexpr parallel_execution_policy par{}; |
(parallelism TS) | |
| constexpr parallel_vector_execution_policy par_vec{}; |
(parallelism TS) | |
seq, par and par_vec are instances of the execution policy types sequential_execution_policy, parallel_execution_policy and parallel_vector_execution_policy respectively. They are used to specify the execution policy of parallel algorithms - i.e., the kinds of parallelism allowed.