[flang-commits] [compiler-rt] [lldb] [llvm] [libunwind] [clang-tools-extra] [libcxx] [libc] [clang] [flang] [libc++] Implement ranges::iota (PR #68494)
Christopher Di Bella via flang-commits
flang-commits at lists.llvm.org
Tue Jan 9 12:27:03 PST 2024
================
@@ -0,0 +1,54 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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___NUMERIC_RANGES_IOTA_H
+#define _LIBCPP___NUMERIC_RANGES_IOTA_H
+
+#include <__algorithm/out_value_result.h>
+#include <__config>
+#include <__ranges/concepts.h>
+#include <__utility/as_const.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 23
+namespace ranges {
+template <typename _Out, typename _Tp>
+using iota_result = ranges::out_value_result<_Out, _Tp>;
+
+struct __iota_fn {
+ template <input_or_output_iterator _Out, sentinel_for<_Out> _Sent, weakly_incrementable _Tp>
+ requires indirectly_writable<_Out, const _Tp&>
+ constexpr iota_result<_Out, _Tp> operator()(_Out __first, _Sent __last, _Tp __value) const {
+ while (__first != __last) {
+ *__first = std::as_const(__value);
+ ++__first;
+ ++__value;
+ }
+ return {std::move(__first), std::move(__value)};
+ }
+
+ template <weakly_incrementable _Tp, ranges::output_range<const _Tp&> _Range>
+ constexpr iota_result<ranges::borrowed_iterator_t<_Range>, _Tp> operator()(_Range&& __r, _Tp __value) const {
+ return (*this)(ranges::begin(__r), ranges::end(__r), std::move(__value));
----------------
cjdb wrote:
I don't see why this would cause problems?
https://github.com/llvm/llvm-project/pull/68494
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