cuda_toolkit/include/__utility/forward.h

// -*- 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_H
#define _LIBCUDACXX___UTILITY_FORWARD_H

#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__

#include "../__type_traits/is_reference.h"
#include "../__type_traits/remove_reference.h"
#include "../cstddef"

#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

template <class _Tp>
_LIBCUDACXX_NODISCARD_EXT inline _LIBCUDACXX_INLINE_VISIBILITY constexpr _Tp&&
forward(__libcpp_remove_reference_t<_Tp>& __t) noexcept {
  return static_cast<_Tp&&>(__t);
}

template <class _Tp>
_LIBCUDACXX_NODISCARD_EXT inline _LIBCUDACXX_INLINE_VISIBILITY constexpr _Tp&&
forward(__libcpp_remove_reference_t<_Tp>&& __t) noexcept {
  static_assert(!is_lvalue_reference<_Tp>::value, "cannot forward an rvalue as an lvalue");
  return static_cast<_Tp&&>(__t);
}

_LIBCUDACXX_END_NAMESPACE_STD

#endif // _LIBCUDACXX___UTILITY_FORWARD_H