1 files changed, 78 insertions, 0 deletions
diff --git a/libcxx/include/__algorithm/ranges_for_each.h b/libcxx/include/__algorithm/ranges_for_each.h
new file mode 100644
index 000000000000..f284c0ee3ad4
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+++ b/libcxx/include/__algorithm/ranges_for_each.h
@@ -0,0 +1,78 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H
+#define _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H
+
+#include <__algorithm/in_fun_result.h>
+#include <__config>
+#include <__functional/identity.h>
+#include <__functional/invoke.h>
+#include <__iterator/concepts.h>
+#include <__iterator/projected.h>
+#include <__ranges/access.h>
+#include <__ranges/concepts.h>
+#include <__ranges/dangling.h>
+#include <__utility/move.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace ranges {
+
+template <class _Iter, class _Func>
+using for_each_result = in_fun_result<_Iter, _Func>;
+
+namespace __for_each {
+struct __fn {
+private:
+  template <class _Iter, class _Sent, class _Proj, class _Func>
+  _LIBCPP_HIDE_FROM_ABI constexpr static
+  for_each_result<_Iter, _Func> __for_each_impl(_Iter __first, _Sent __last, _Func& __func, _Proj& __proj) {
+    for (; __first != __last; ++__first)
+      std::invoke(__func, std::invoke(__proj, *__first));
+    return {std::move(__first), std::move(__func)};
+  }
+
+public:
+  template <input_iterator _Iter, sentinel_for<_Iter> _Sent,
+            class _Proj = identity,
+            indirectly_unary_invocable<projected<_Iter, _Proj>> _Func>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  for_each_result<_Iter, _Func> operator()(_Iter __first, _Sent __last, _Func __func, _Proj __proj = {}) const {
+    return __for_each_impl(std::move(__first), std::move(__last), __func, __proj);
+  }
+
+  template <input_range _Range,
+            class _Proj = identity,
+            indirectly_unary_invocable<projected<iterator_t<_Range>, _Proj>> _Func>
+  _LIBCPP_HIDE_FROM_ABI constexpr
+  for_each_result<borrowed_iterator_t<_Range>, _Func> operator()(_Range&& __range,
+                                                                 _Func __func,
+                                                                 _Proj __proj = {}) const {
+    return __for_each_impl(ranges::begin(__range), ranges::end(__range), __func, __proj);
+  }
+
+};
+} // namespace __for_each
+
+inline namespace __cpo {
+  inline constexpr auto for_each = __for_each::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
+
+#endif // _LIBCPP___ALGORITHM_RANGES_FOR_EACH_H