libcxx/include/__algorithm/ranges_fill.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___ALGORITHM_RANGES_FILL_H
  10 #define _LIBCPP___ALGORITHM_RANGES_FILL_H
  11
  12 #include <__algorithm/ranges_fill_n.h>
  13 #include <__config>
  14 #include <__iterator/concepts.h>
  15 #include <__ranges/access.h>
  16 #include <__ranges/concepts.h>
  17 #include <__ranges/dangling.h>
  18
  19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  20 #  pragma GCC system_header
  21 #endif
  22
  23 _LIBCPP_PUSH_MACROS
  24 #include <__undef_macros>
  25
  26 #if _LIBCPP_STD_VER >= 20
  27
  28 _LIBCPP_BEGIN_NAMESPACE_STD
  29
  30 namespace ranges {
  31 struct __fill {
  32   template <class _Type, output_iterator<const _Type&> _Iter, sentinel_for<_Iter> _Sent>
  33   _LIBCPP_HIDE_FROM_ABI constexpr _Iter operator()(_Iter __first, _Sent __last, const _Type& __value) const {
  34     if constexpr (random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>) {
  35       return ranges::fill_n(__first, __last - __first, __value);
  36     } else {
  37       for (; __first != __last; ++__first)
  38         *__first = __value;
  39       return __first;
  40     }
  41   }
  42
  43   template <class _Type, output_range<const _Type&> _Range>
  44   _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range> operator()(_Range&& __range, const _Type& __value) const {
  45     return (*this)(ranges::begin(__range), ranges::end(__range), __value);
  46   }
  47 };
  48
  49 inline namespace __cpo {
  50 inline constexpr auto fill = __fill{};
  51 } // namespace __cpo
  52 } // namespace ranges
  53
  54 _LIBCPP_END_NAMESPACE_STD
  55
  56 #endif // _LIBCPP_STD_VER >= 20
  57
  58 _LIBCPP_POP_MACROS
  59
  60 #endif // _LIBCPP___ALGORITHM_RANGES_FILL_H