// -*- 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___FUNCTIONAL_UNARY_NEGATE_H
#define _LIBCUDACXX___FUNCTIONAL_UNARY_NEGATE_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/unary_function.h>

_LIBCUDACXX_BEGIN_NAMESPACE_STD

#if _CCCL_STD_VER <= 2017 || defined(_LIBCUDACXX_ENABLE_CXX20_REMOVED_NEGATORS)

_CCCL_SUPPRESS_DEPRECATED_PUSH

template <class _Predicate>
class _CCCL_TYPE_VISIBILITY_DEFAULT
_LIBCUDACXX_DEPRECATED_IN_CXX17 unary_negate : public __unary_function<typename _Predicate::argument_type, bool>
{
  _Predicate __pred_;

public:
  constexpr _LIBCUDACXX_HIDE_FROM_ABI explicit unary_negate(const _Predicate& __pred)
      : __pred_(__pred)
  {}
  _CCCL_EXEC_CHECK_DISABLE
  constexpr _LIBCUDACXX_HIDE_FROM_ABI bool operator()(const typename _Predicate::argument_type& __x) const
  {
    return !__pred_(__x);
  }
};

template <class _Predicate>
_LIBCUDACXX_DEPRECATED_IN_CXX17 _LIBCUDACXX_HIDE_FROM_ABI constexpr unary_negate<_Predicate>
not1(const _Predicate& __pred)
{
  return unary_negate<_Predicate>(__pred);
}

_CCCL_SUPPRESS_DEPRECATED_POP

#endif // _CCCL_STD_VER <= 2017 || defined(_LIBCUDACXX_ENABLE_CXX20_REMOVED_NEGATORS)

_LIBCUDACXX_END_NAMESPACE_STD

#endif // _LIBCUDACXX___FUNCTIONAL_UNARY_NEGATE_H
