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501e3f2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | // -*- 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
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___UTILITY_FORWARD_LIKE_H
#define _LIBCUDACXX___UTILITY_FORWARD_LIKE_H
#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__
#include "../__type_traits/conditional.h"
#include "../__type_traits/is_const.h"
#include "../__type_traits/is_reference.h"
#include "../__type_traits/remove_reference.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
_LIBCUDACXX_BEGIN_NAMESPACE_STD
#if _LIBCUDACXX_STD_VER > 20
template <class _Ap, class _Bp>
using _CopyConst = _If<is_const_v<_Ap>, const _Bp, _Bp>;
template <class _Ap, class _Bp>
using _OverrideRef = _If<is_rvalue_reference_v<_Ap>, remove_reference_t<_Bp>&&, _Bp&>;
template <class _Ap, class _Bp>
using _ForwardLike = _OverrideRef<_Ap&&, _CopyConst<remove_reference_t<_Ap>, remove_reference_t<_Bp>>>;
template <class _Tp, class _Up>
_LIBCUDACXX_NODISCARD_ATTRIBUTE _LIBCUDACXX_HIDE_FROM_ABI _LIBCUDACXX_INLINE_VISIBILITY
constexpr auto forward_like(_Up&& __ux) noexcept -> _ForwardLike<_Tp, _Up> {
return static_cast<_ForwardLike<_Tp, _Up>>(__ux);
}
#endif // _LIBCUDACXX_STD_VER > 20
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___UTILITY_FORWARD_LIKE_H
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