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_TRANSFORM_H 10 #define _LIBCPP___ALGORITHM_PSTL_TRANSFORM_H 11 12 #include <__algorithm/pstl_backend.h> 13 #include <__config> 14 #include <__iterator/cpp17_iterator_concepts.h> 15 #include <__type_traits/enable_if.h> 16 #include <__type_traits/is_execution_policy.h> 17 #include <__type_traits/remove_cvref.h> 18 #include <__utility/move.h> 19 #include <optional> 20 21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22 # pragma GCC system_header 23 #endif 24 25 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17 26 27 _LIBCPP_BEGIN_NAMESPACE_STD 28 29 template <class _ExecutionPolicy, 30 class _ForwardIterator, 31 class _ForwardOutIterator, 32 class _UnaryOperation, 33 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, 34 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> 35 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardOutIterator>> 36 __transform(_ExecutionPolicy&&, 37 _ForwardIterator&& __first, 38 _ForwardIterator&& __last, 39 _ForwardOutIterator&& __result, 40 _UnaryOperation&& __op) noexcept { 41 using _Backend = typename __select_backend<_RawPolicy>::type; 42 return std::__pstl_transform<_RawPolicy>( 43 _Backend{}, std::move(__first), std::move(__last), std::move(__result), std::move(__op)); 44 } 45 46 template <class _ExecutionPolicy, 47 class _ForwardIterator, 48 class _ForwardOutIterator, 49 class _UnaryOperation, 50 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, 51 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> 52 _LIBCPP_HIDE_FROM_ABI _ForwardOutIterator transform( 53 _ExecutionPolicy&& __policy, 54 _ForwardIterator __first, 55 _ForwardIterator __last, 56 _ForwardOutIterator __result, 57 _UnaryOperation __op) { 58 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator); 59 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardOutIterator); 60 _LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(_ForwardOutIterator, decltype(__op(*__first))); 61 auto __res = std::__transform(__policy, std::move(__first), std::move(__last), std::move(__result), std::move(__op)); 62 if (!__res) 63 std::__throw_bad_alloc(); 64 return *std::move(__res); 65 } 66 67 template <class _ExecutionPolicy, 68 class _ForwardIterator1, 69 class _ForwardIterator2, 70 class _ForwardOutIterator, 71 class _BinaryOperation, 72 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, 73 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> 74 _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardOutIterator>> 75 __transform(_ExecutionPolicy&&, 76 _ForwardIterator1&& __first1, 77 _ForwardIterator1&& __last1, 78 _ForwardIterator2&& __first2, 79 _ForwardOutIterator&& __result, 80 _BinaryOperation&& __op) noexcept { 81 using _Backend = typename __select_backend<_RawPolicy>::type; 82 return std::__pstl_transform<_RawPolicy>( 83 _Backend{}, std::move(__first1), std::move(__last1), std::move(__first2), std::move(__result), std::move(__op)); 84 } 85 86 template <class _ExecutionPolicy, 87 class _ForwardIterator1, 88 class _ForwardIterator2, 89 class _ForwardOutIterator, 90 class _BinaryOperation, 91 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>, 92 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0> 93 _LIBCPP_HIDE_FROM_ABI _ForwardOutIterator transform( 94 _ExecutionPolicy&& __policy, 95 _ForwardIterator1 __first1, 96 _ForwardIterator1 __last1, 97 _ForwardIterator2 __first2, 98 _ForwardOutIterator __result, 99 _BinaryOperation __op) { 100 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator1); 101 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator2); 102 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardOutIterator); 103 _LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(_ForwardOutIterator, decltype(__op(*__first1, *__first2))); 104 auto __res = std::__transform( 105 __policy, std::move(__first1), std::move(__last1), std::move(__first2), std::move(__result), std::move(__op)); 106 if (!__res) 107 std::__throw_bad_alloc(); 108 return *std::move(__res); 109 } 110 111 _LIBCPP_END_NAMESPACE_STD 112 113 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17 114 115 #endif // _LIBCPP___ALGORITHM_PSTL_TRANSFORM_H 116