1 files changed, 76 insertions, 0 deletions
diff --git a/contrib/llvm-project/libcxx/include/__pstl/internal/execution_defs.h b/contrib/llvm-project/libcxx/include/__pstl/internal/execution_defs.h
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index 000000000000..5992f0e4a375
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+++ b/contrib/llvm-project/libcxx/include/__pstl/internal/execution_defs.h
@@ -0,0 +1,76 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _PSTL_EXECUTION_POLICY_DEFS_H
+#define _PSTL_EXECUTION_POLICY_DEFS_H
+
+#include <__config>
+#include <__type_traits/decay.h>
+#include <__type_traits/enable_if.h>
+#include <__type_traits/integral_constant.h>
+
+#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
+
+namespace __pstl {
+namespace execution {
+inline namespace v1 {
+
+// 2.4, Sequential execution policy
+class sequenced_policy {};
+
+// 2.5, Parallel execution policy
+class parallel_policy {};
+
+// 2.6, Parallel+Vector execution policy
+class parallel_unsequenced_policy {};
+
+class unsequenced_policy {};
+
+// 2.8, Execution policy objects
+constexpr sequenced_policy seq{};
+constexpr parallel_policy par{};
+constexpr parallel_unsequenced_policy par_unseq{};
+constexpr unsequenced_policy unseq{};
+
+// 2.3, Execution policy type trait
+template <class>
+struct is_execution_policy : std::false_type {};
+
+template <>
+struct is_execution_policy<__pstl::execution::sequenced_policy> : std::true_type {};
+template <>
+struct is_execution_policy<__pstl::execution::parallel_policy> : std::true_type {};
+template <>
+struct is_execution_policy<__pstl::execution::parallel_unsequenced_policy> : std::true_type {};
+template <>
+struct is_execution_policy<__pstl::execution::unsequenced_policy> : std::true_type {};
+
+template <class _Tp>
+constexpr bool is_execution_policy_v = __pstl::execution::is_execution_policy<_Tp>::value;
+} // namespace v1
+} // namespace execution
+
+namespace __internal {
+template <class _ExecPolicy, class _Tp>
+using __enable_if_execution_policy =
+    typename std::enable_if<__pstl::execution::is_execution_policy<typename std::decay<_ExecPolicy>::type>::value,
+                            _Tp>::type;
+
+template <class _IsVector>
+struct __serial_tag;
+template <class _IsVector>
+struct __parallel_tag;
+
+} // namespace __internal
+
+} // namespace __pstl
+
+#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
+
+#endif /* _PSTL_EXECUTION_POLICY_DEFS_H */