tmp/tmp084fj52y/{from.md → to.md}
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### Header `<execution>` synopsis <a id="execution.syn">[[execution.syn]]</a>
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``` cpp
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namespace std {
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// [execpol.type], execution policy type trait
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template<class T> struct is_execution_policy;
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template<class T> inline constexpr bool is_execution_policy_v = is_execution_policy<T>::value;
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}
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namespace std::execution {
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// [execpol.seq], sequenced execution policy
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class sequenced_policy;
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// [execpol.par], parallel execution policy
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class parallel_policy;
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// [execpol.parunseq], parallel and unsequenced execution policy
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class parallel_unsequenced_policy;
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// [execpol.objects], execution policy objects
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inline constexpr sequenced_policy seq{ unspecified };
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inline constexpr parallel_policy par{ unspecified };
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inline constexpr parallel_unsequenced_policy par_unseq{ unspecified };
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}
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```
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