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 34namespace ranges { 35 36template <class _Iter, class _Func> 37using for_each_result = in_fun_result<_Iter, _Func>; 38 39namespace __for_each { 40struct __fn { 41private: 42 template <class _Iter, class _Sent, class _Proj, class _Func> 43 _LIBCPP_HIDE_FROM_ABI constexpr static for_each_result<_Iter, _Func> 44 __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 50public: 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> 56 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> 64 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 70inline namespace __cpo { 71inline 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