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Add is_execution_policy trait and is_execution_policy_v variable #42

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Add is_execution_policy trait and is_execution_policy_v variable #42

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19 changes: 19 additions & 0 deletions include/poolstl/execution
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Original file line number Diff line number Diff line change
Expand Up @@ -196,6 +196,25 @@ namespace poolstl {
using is_pure_threads_policy = std::is_same<poolstl::execution::pure_threads_policy,
typename std::remove_cv<typename std::remove_reference<ExecPolicy>::type>::type>;
}

/**
* Test whether a type is a poolSTL execution policy.
* Mirrors C++17's std::is_execution_policy for poolSTL policies.
*/
template <class T>
struct is_execution_policy : std::false_type {};

template <>
struct is_execution_policy<execution::sequenced_policy> : std::true_type {};

template <>
struct is_execution_policy<execution::parallel_policy> : std::true_type {};

template <>
struct is_execution_policy<execution::pure_threads_policy> : std::true_type {};

template <class T>
constexpr bool is_execution_policy_v = is_execution_policy<T>::value;
}

#endif
5 changes: 5 additions & 0 deletions include/poolstl/poolstl.hpp
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Expand Up @@ -66,6 +66,11 @@ namespace std {
using parallel_unsequenced_policy = ::poolstl::execution::parallel_policy;
constexpr parallel_unsequenced_policy par_unseq{};
}

using ::poolstl::is_execution_policy;

template <class T>
constexpr bool is_execution_policy_v = ::poolstl::is_execution_policy<T>::value;
}

#endif
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