================ @@ -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 { ---------------- philnik777 wrote:
`static operator()` has been introduced in C++23, so we can't (currently) use it for C++20 algorithms. Otherwise we would also use it there. The simple reason to use it is that we don't care about the object and the `static` version has slightly better code gen (https://godbolt.org/z/8E1f77q6f). 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
