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//===----------------------------------------------------------------------===//
//
// 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
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
// SPDX-FileCopyrightText: Copyright (c) 2023 Microsoft Corporation.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___ITERATOR_UNREACHABLE_SENTINEL_H
#define _LIBCUDACXX___ITERATOR_UNREACHABLE_SENTINEL_H
#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__
#include "../__iterator/concepts.h"
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
#if _LIBCUDACXX_STD_VER > 14
_LIBCUDACXX_BEGIN_NAMESPACE_STD
_LIBCUDACXX_BEGIN_NAMESPACE_RANGES_ABI
// MSVC requires an interesting workaround for a /permissive- bug
// We cannot simply define unreachable_sentinel_t with it friendfunctions,
// but we must derive from a base class in a different namespace so that they
// are only ever found through ADL
struct unreachable_sentinel_t
#ifdef _LIBCUDACXX_COMPILER_MSVC
;
namespace __unreachable_sentinel_detail {
struct __unreachable_base
#endif // _LIBCUDACXX_COMPILER_MSVC
{
_LIBCUDACXX_TEMPLATE(class _Iter)
_LIBCUDACXX_REQUIRES(weakly_incrementable<_Iter>)
_LIBCUDACXX_HIDE_FROM_ABI
_LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_NODISCARD_FRIEND constexpr bool
operator==(const unreachable_sentinel_t &, const _Iter &) noexcept {
return false;
}
#if _LIBCUDACXX_STD_VER < 20
_LIBCUDACXX_TEMPLATE(class _Iter)
_LIBCUDACXX_REQUIRES(weakly_incrementable<_Iter>)
_LIBCUDACXX_HIDE_FROM_ABI
_LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_NODISCARD_FRIEND constexpr bool
operator==(const _Iter &, const unreachable_sentinel_t &) noexcept {
return false;
}
_LIBCUDACXX_TEMPLATE(class _Iter)
_LIBCUDACXX_REQUIRES(weakly_incrementable<_Iter>)
_LIBCUDACXX_HIDE_FROM_ABI
_LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_NODISCARD_FRIEND constexpr bool
operator!=(const unreachable_sentinel_t &, const _Iter &) noexcept {
return true;
}
_LIBCUDACXX_TEMPLATE(class _Iter)
_LIBCUDACXX_REQUIRES(weakly_incrementable<_Iter>)
_LIBCUDACXX_HIDE_FROM_ABI
_LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_NODISCARD_FRIEND constexpr bool
operator!=(const _Iter &, const unreachable_sentinel_t &) noexcept {
return true;
}
#endif // _LIBCUDACXX_STD_VER < 20
};
#ifdef _LIBCUDACXX_COMPILER_MSVC
} // namespace __unreachable_sentinel_detail
struct unreachable_sentinel_t
: __unreachable_sentinel_detail::__unreachable_base {};
#endif // _LIBCUDACXX_COMPILER_MSVC
_LIBCUDACXX_END_NAMESPACE_RANGES_ABI
_LIBCUDACXX_CPO_ACCESSIBILITY unreachable_sentinel_t unreachable_sentinel{};
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX_STD_VER > 14
#endif // _LIBCUDACXX___ITERATOR_UNREACHABLE_SENTINEL_H
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