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{};
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constexpr parallel_execution_policy par{};
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constexpr parallel_vector_execution_policy par_vec{};
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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.