v1/__algorithm/ranges_fill.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_FILL_H
0010 #define _LIBCPP___ALGORITHM_RANGES_FILL_H
0011
0012 #include <__algorithm/ranges_fill_n.h>
0013 #include <__config>
0014 #include <__iterator/concepts.h>
0015 #include <__ranges/access.h>
0016 #include <__ranges/concepts.h>
0017 #include <__ranges/dangling.h>
0018
0019 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0020 #  pragma GCC system_header
0021 #endif
0022
0023 _LIBCPP_PUSH_MACROS
0024 #include <__undef_macros>
0025
0026 #if _LIBCPP_STD_VER >= 20
0027
0028 _LIBCPP_BEGIN_NAMESPACE_STD
0029
0030 namespace ranges {
0031 struct __fill {
0032   template <class _Type, output_iterator<const _Type&> _Iter, sentinel_for<_Iter> _Sent>
0033   _LIBCPP_HIDE_FROM_ABI constexpr _Iter operator()(_Iter __first, _Sent __last, const _Type& __value) const {
0034     if constexpr (random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>) {
0035       return ranges::fill_n(__first, __last - __first, __value);
0036     } else {
0037       for (; __first != __last; ++__first)
0038         *__first = __value;
0039       return __first;
0040     }
0041   }
0042
0043   template <class _Type, output_range<const _Type&> _Range>
0044   _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range> operator()(_Range&& __range, const _Type& __value) const {
0045     return (*this)(ranges::begin(__range), ranges::end(__range), __value);
0046   }
0047 };
0048
0049 inline namespace __cpo {
0050 inline constexpr auto fill = __fill{};
0051 } // namespace __cpo
0052 } // namespace ranges
0053
0054 _LIBCPP_END_NAMESPACE_STD
0055
0056 #endif // _LIBCPP_STD_VER >= 20
0057
0058 _LIBCPP_POP_MACROS
0059
0060 #endif // _LIBCPP___ALGORITHM_RANGES_FILL_H