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Diffstat (limited to 'libcxx/include/__ranges/dangling.h')
-rw-r--r-- | libcxx/include/__ranges/dangling.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/libcxx/include/__ranges/dangling.h b/libcxx/include/__ranges/dangling.h new file mode 100644 index 000000000000..deb02a1a448d --- /dev/null +++ b/libcxx/include/__ranges/dangling.h @@ -0,0 +1,47 @@ +// -*- 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___RANGES_DANGLING_H +#define _LIBCPP___RANGES_DANGLING_H + +#include <__config> +#include <__ranges/access.h> +#include <__ranges/concepts.h> +#include <type_traits> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +#pragma GCC system_header +#endif + +_LIBCPP_PUSH_MACROS +#include <__undef_macros> + +_LIBCPP_BEGIN_NAMESPACE_STD + +#if !defined(_LIBCPP_HAS_NO_RANGES) + +namespace ranges { +struct dangling { + dangling() = default; + _LIBCPP_HIDE_FROM_ABI constexpr dangling(auto&&...) noexcept {} +}; + +template <range _Rp> +using borrowed_iterator_t = _If<borrowed_range<_Rp>, iterator_t<_Rp>, dangling>; + +// borrowed_subrange_t defined in <__ranges/subrange.h> +} // namespace ranges + +#endif // !_LIBCPP_HAS_NO_RANGES + +_LIBCPP_END_NAMESPACE_STD + +_LIBCPP_POP_MACROS + +#endif // _LIBCPP___RANGES_DANGLING_H |