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_RANGES_FOR_EACH_H 10 #define _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H 11 12 #include <__algorithm/in_fun_result.h> 13 #include <__config> 14 #include <__functional/identity.h> 15 #include <__functional/invoke.h> 16 #include <__iterator/concepts.h> 17 #include <__iterator/projected.h> 18 #include <__ranges/access.h> 19 #include <__ranges/concepts.h> 20 #include <__ranges/dangling.h> 21 #include <__utility/move.h> 22 23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 24 # pragma GCC system_header 25 #endif 26 27 _LIBCPP_PUSH_MACROS 28 #include <__undef_macros> 29 30 #if _LIBCPP_STD_VER >= 20 31 32 _LIBCPP_BEGIN_NAMESPACE_STD 33 34 namespace ranges { 35 36 template <class _Iter, class _Func> 37 using for_each_result = in_fun_result<_Iter, _Func>; 38 39 namespace __for_each { 40 struct __fn { 41 private: 42 template <class _Iter, class _Sent, class _Proj, class _Func> 43 _LIBCPP_HIDE_FROM_ABI constexpr static for_each_result<_Iter, _Func> __for_each_impl__fn44 __for_each_impl(_Iter __first, _Sent __last, _Func& __func, _Proj& __proj) { 45 for (; __first != __last; ++__first) 46 std::invoke(__func, std::invoke(__proj, *__first)); 47 return {std::move(__first), std::move(__func)}; 48 } 49 50 public: 51 template <input_iterator _Iter, 52 sentinel_for<_Iter> _Sent, 53 class _Proj = identity, 54 indirectly_unary_invocable<projected<_Iter, _Proj>> _Func> 55 _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<_Iter, _Func> operator__fn56 operator()(_Iter __first, _Sent __last, _Func __func, _Proj __proj = {}) const { 57 return __for_each_impl(std::move(__first), std::move(__last), __func, __proj); 58 } 59 60 template <input_range _Range, 61 class _Proj = identity, 62 indirectly_unary_invocable<projected<iterator_t<_Range>, _Proj>> _Func> 63 _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<borrowed_iterator_t<_Range>, _Func> operator__fn64 operator()(_Range&& __range, _Func __func, _Proj __proj = {}) const { 65 return __for_each_impl(ranges::begin(__range), ranges::end(__range), __func, __proj); 66 } 67 }; 68 } // namespace __for_each 69 70 inline namespace __cpo { 71 inline constexpr auto for_each = __for_each::__fn{}; 72 } // namespace __cpo 73 } // namespace ranges 74 75 _LIBCPP_END_NAMESPACE_STD 76 77 #endif // _LIBCPP_STD_VER >= 20 78 79 _LIBCPP_POP_MACROS 80 81 #endif // _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H 82