v1/__algorithm/ranges_for_each.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H
0010 #define _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H
0011
0012 #include <__algorithm/in_fun_result.h>
0013 #include <__config>
0014 #include <__functional/identity.h>
0015 #include <__functional/invoke.h>
0016 #include <__iterator/concepts.h>
0017 #include <__iterator/projected.h>
0018 #include <__ranges/access.h>
0019 #include <__ranges/concepts.h>
0020 #include <__ranges/dangling.h>
0021 #include <__utility/move.h>
0022
0023 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0024 #  pragma GCC system_header
0025 #endif
0026
0027 _LIBCPP_PUSH_MACROS
0028 #include <__undef_macros>
0029
0030 #if _LIBCPP_STD_VER >= 20
0031
0032 _LIBCPP_BEGIN_NAMESPACE_STD
0033
0034 namespace ranges {
0035
0036 template <class _Iter, class _Func>
0037 using for_each_result = in_fun_result<_Iter, _Func>;
0038
0039 struct __for_each {
0040 private:
0041   template <class _Iter, class _Sent, class _Proj, class _Func>
0042   _LIBCPP_HIDE_FROM_ABI constexpr static for_each_result<_Iter, _Func>
0043   __for_each_impl(_Iter __first, _Sent __last, _Func& __func, _Proj& __proj) {
0044     for (; __first != __last; ++__first)
0045       std::invoke(__func, std::invoke(__proj, *__first));
0046     return {std::move(__first), std::move(__func)};
0047   }
0048
0049 public:
0050   template <input_iterator _Iter,
0051             sentinel_for<_Iter> _Sent,
0052             class _Proj = identity,
0053             indirectly_unary_invocable<projected<_Iter, _Proj>> _Func>
0054   _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<_Iter, _Func>
0055   operator()(_Iter __first, _Sent __last, _Func __func, _Proj __proj = {}) const {
0056     return __for_each_impl(std::move(__first), std::move(__last), __func, __proj);
0057   }
0058
0059   template <input_range _Range,
0060             class _Proj = identity,
0061             indirectly_unary_invocable<projected<iterator_t<_Range>, _Proj>> _Func>
0062   _LIBCPP_HIDE_FROM_ABI constexpr for_each_result<borrowed_iterator_t<_Range>, _Func>
0063   operator()(_Range&& __range, _Func __func, _Proj __proj = {}) const {
0064     return __for_each_impl(ranges::begin(__range), ranges::end(__range), __func, __proj);
0065   }
0066 };
0067
0068 inline namespace __cpo {
0069 inline constexpr auto for_each = __for_each{};
0070 } // namespace __cpo
0071 } // namespace ranges
0072
0073 _LIBCPP_END_NAMESPACE_STD
0074
0075 #endif // _LIBCPP_STD_VER >= 20
0076
0077 _LIBCPP_POP_MACROS
0078
0079 #endif // _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H