friend auto tag_invoke()

in include/unifex/bulk_transform.hpp [88:106]

• 18 lines of code
• 7 McCabe index (conditional complexity)

    friend auto tag_invoke(tag_t<get_execution_policy>, const type& r) noexcept {
        using receiver_policy = decltype(get_execution_policy(r.receiver_));
        constexpr bool allowUnsequenced =
          is_one_of_v<receiver_policy, unsequenced_policy, parallel_unsequenced_policy> &&
          is_one_of_v<Policy, unsequenced_policy, parallel_unsequenced_policy>;
        constexpr bool allowParallel =
          is_one_of_v<receiver_policy, parallel_policy, parallel_unsequenced_policy> &&
          is_one_of_v<Policy, parallel_policy, parallel_unsequenced_policy>;

        if constexpr (allowUnsequenced && allowParallel) {
            return unifex::par_unseq;
        } else if constexpr (allowUnsequenced) {
            return unifex::unseq;
        } else if constexpr (allowParallel) {
            return unifex::par;
        } else {
            return unifex::seq;
        }
    }