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 struct __for_each { 40 private: 41 template <class _Iter, class _Sent, class _Proj, class _Func> 42 _LIBCPP_HIDE_FROM_ABI constexpr static for_each_result<_Iter, _Func> 43 __for_each_impl(_Iter __first, _Sent __last, _Func& __func, _Proj& __proj) { 44 for (; __first != __last; ++__first) 45 std::invoke(__func, std::invoke(__proj, *__first)); 46 return {std::move(__first), std::move(__func)}; 47 } 48 49 public: 50 template <input_iterator _Iter, 51 sentinel_for<_Iter> _Sent, 52 class _Proj = identity, 53 indirectly_unary_invocable<projected<_Iter, _Proj>> _Func> 54 _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<_Iter, _Func> 55 operator()(_Iter __first, _Sent __last, _Func __func, _Proj __proj = {}) const { 56 return __for_each_impl(std::move(__first), std::move(__last), __func, __proj); 57 } 58 59 template <input_range _Range, 60 class _Proj = identity, 61 indirectly_unary_invocable<projected<iterator_t<_Range>, _Proj>> _Func> 62 _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<borrowed_iterator_t<_Range>, _Func> 63 operator()(_Range&& __range, _Func __func, _Proj __proj = {}) const { 64 return __for_each_impl(ranges::begin(__range), ranges::end(__range), __func, __proj); 65 } 66 }; 67 68 inline namespace __cpo { 69 inline constexpr auto for_each = __for_each{}; 70 } // namespace __cpo 71 } // namespace ranges 72 73 _LIBCPP_END_NAMESPACE_STD 74 75 #endif // _LIBCPP_STD_VER >= 20 76 77 _LIBCPP_POP_MACROS 78 79 #endif // _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H 80