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// -*- 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) 2023-24 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___FUNCTIONAL_IDENTITY_H
#define _LIBCUDACXX___FUNCTIONAL_IDENTITY_H
#include <cuda/std/detail/__config>
#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
#include <cuda/std/__functional/reference_wrapper.h>
#include <cuda/std/__type_traits/integral_constant.h>
#include <cuda/std/__utility/forward.h>
#include <cuda/std/__cccl/prologue.h>
_LIBCUDACXX_BEGIN_NAMESPACE_STD
template <class _Tp>
struct __is_identity : false_type
{};
struct identity
{
template <class _Tp>
[[nodiscard]] _CCCL_API constexpr _Tp&& operator()(_Tp&& __t) const noexcept
{
return _CUDA_VSTD::forward<_Tp>(__t);
}
using is_transparent = void;
};
template <>
struct __is_identity<identity> : true_type
{};
template <>
struct __is_identity<reference_wrapper<identity>> : true_type
{};
template <>
struct __is_identity<reference_wrapper<const identity>> : true_type
{};
_LIBCUDACXX_END_NAMESPACE_STD
#include <cuda/std/__cccl/epilogue.h>
#endif // _LIBCUDACXX___FUNCTIONAL_IDENTITY_H
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