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 #if _LIBCPP_STD_VER >= 20 28 29 _LIBCPP_BEGIN_NAMESPACE_STD 30 31 namespace ranges { 32 33 template <class _Iter, class _Func> 34 using for_each_result = in_fun_result<_Iter, _Func>; 35 36 namespace __for_each { 37 struct __fn { 38 private: 39 template <class _Iter, class _Sent, class _Proj, class _Func> 40 _LIBCPP_HIDE_FROM_ABI constexpr static for_each_result<_Iter, _Func> 41 __for_each_impl(_Iter __first, _Sent __last, _Func& __func, _Proj& __proj) { 42 for (; __first != __last; ++__first) 43 std::invoke(__func, std::invoke(__proj, *__first)); 44 return {std::move(__first), std::move(__func)}; 45 } 46 47 public: 48 template <input_iterator _Iter, 49 sentinel_for<_Iter> _Sent, 50 class _Proj = identity, 51 indirectly_unary_invocable<projected<_Iter, _Proj>> _Func> 52 _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<_Iter, _Func> 53 operator()(_Iter __first, _Sent __last, _Func __func, _Proj __proj = {}) const { 54 return __for_each_impl(std::move(__first), std::move(__last), __func, __proj); 55 } 56 57 template <input_range _Range, 58 class _Proj = identity, 59 indirectly_unary_invocable<projected<iterator_t<_Range>, _Proj>> _Func> 60 _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<borrowed_iterator_t<_Range>, _Func> 61 operator()(_Range&& __range, _Func __func, _Proj __proj = {}) const { 62 return __for_each_impl(ranges::begin(__range), ranges::end(__range), __func, __proj); 63 } 64 }; 65 } // namespace __for_each 66 67 inline namespace __cpo { 68 inline constexpr auto for_each = __for_each::__fn{}; 69 } // namespace __cpo 70 } // namespace ranges 71 72 _LIBCPP_END_NAMESPACE_STD 73 74 #endif // _LIBCPP_STD_VER >= 20 75 76 #endif // _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H 77