std::execution::seq,std::execution::par,std::execution::par_unseq,std::execution::unseq (3) - Linux Manuals

std::execution::seq,std::execution::par,std::execution::par_unseq,std::execution::unseq: std::execution::seq,std::execution::par,std::execution::par_unseq,std::execution::unseq

NAME

std::execution::seq,std::execution::par,std::execution::par_unseq,std::execution::unseq - std::execution::seq,std::execution::par,std::execution::par_unseq,std::execution::unseq

Synopsis

Defined in header <execution>
inline constexpr std::execution::sequenced_policy seq { /* unspecified */ }; (since C++17)
inline constexpr std::execution::parallel_policy par { /* unspecified */ }; (since C++17)
inline constexpr std::execution::parallel_unsequenced_policy par_unseq { /* unspecified */ }; (since C++17)
inline constexpr std::execution::unsequenced_policy unseq { /* unspecified */ }; (since C++20)

std::execution::seq, std::execution::par, std::execution::par_unseq, and std::execution::unseq are instances of the execution policy types std::execution::sequenced_policy, std::execution::parallel_policy, std::execution::parallel_unsequenced_policy, and std::execution::unsequenced_policy respectively. They are used to specify the execution policy of parallel algorithms - i.e., the kinds of parallelism allowed.
Additional execution policies may be provided by a standard library implementation (possible future additions may include std::parallel::cuda and std::parallel::opencl)