================ @@ -0,0 +1,71 @@ +// -*- 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/access.h> +#include <__ranges/concepts.h> +#include <__ranges/dangling.h> +#include <__utility/as_const.h> +#include <__utility/move.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>; + +namespace __ranges_iota { +struct __iota_fn { +private: + // Private helper function + template <class _Out, class _Sent, class _Tp> + _LIBCPP_HIDE_FROM_ABI static constexpr iota_result<_Out, _Tp> __iota_impl(_Out __first, _Sent __last, _Tp __value) { + while (__first != __last) { + *__first = std::as_const(__value); + ++__first; + ++__value; + } + return {std::move(__first), std::move(__value)}; + } ---------------- cjdb wrote:
Please move this into the iterator-based `operator()` and have the range-based one call that. As it's currently implemented, additional and unnecessary moves need to happen, and we also incur some debug overhead that I'd rather avoid. https://github.com/llvm/llvm-project/pull/68494 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
