1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___ALGORITHM_PSTL_FOR_EACH_H 10 #define _LIBCPP___ALGORITHM_PSTL_FOR_EACH_H 11 12 #include <__algorithm/for_each.h> 13 #include <__algorithm/for_each_n.h> 14 #include <__algorithm/pstl_backend.h> 15 #include <__algorithm/pstl_frontend_dispatch.h> 16 #include <__config> 17 #include <__iterator/cpp17_iterator_concepts.h> 18 #include <__iterator/iterator_traits.h> 19 #include <__type_traits/enable_if.h> 20 #include <__type_traits/is_execution_policy.h> 21 #include <__type_traits/remove_cvref.h> 22 #include <__type_traits/void_t.h> 23 #include <__utility/move.h> 24 #include <__utility/terminate_on_exception.h> 25 26 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 27 # pragma GCC system_header 28 #endif 29 30 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17 31 32 _LIBCPP_BEGIN_NAMESPACE_STD 33 34 template <class _ExecutionPolicy, 35 class _ForwardIterator, 36 class _Function, 37 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, 38 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> 39 _LIBCPP_HIDE_FROM_ABI void 40 for_each(_ExecutionPolicy&&, _ForwardIterator __first, _ForwardIterator __last, _Function __func) { 41 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator); 42 using _Backend = typename __select_backend<_RawPolicy>::type; 43 std::__pstl_for_each<_RawPolicy>(_Backend{}, std::move(__first), std::move(__last), std::move(__func)); 44 } 45 46 template <class> 47 void __pstl_for_each_n(); // declaration needed for the frontend dispatch below 48 49 template <class _ExecutionPolicy, 50 class _ForwardIterator, 51 class _Size, 52 class _Function, 53 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, 54 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> 55 _LIBCPP_HIDE_FROM_ABI void 56 for_each_n(_ExecutionPolicy&& __policy, _ForwardIterator __first, _Size __size, _Function __func) { 57 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator); 58 return std::__pstl_frontend_dispatch( 59 _LIBCPP_PSTL_CUSTOMIZATION_POINT(__pstl_for_each_n), 60 [&](_ForwardIterator __g_first, _Size __g_size, _Function __g_func) { 61 if constexpr (__has_random_access_iterator_category<_ForwardIterator>::value) { 62 std::for_each(__policy, std::move(__g_first), __g_first + __g_size, std::move(__g_func)); 63 } else { 64 std::for_each_n(std::move(__g_first), __g_size, std::move(__g_func)); 65 } 66 }, 67 __first, 68 __size, 69 std::move(__func)); 70 } 71 72 _LIBCPP_END_NAMESPACE_STD 73 74 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17 75 76 #endif // _LIBCPP___ALGORITHM_PSTL_FOR_EACH_H 77