//===----------------------------------------------------------------------===//
//
// 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___TYPE_TRAITS_IS_MEMBER_FUNCTION_POINTER_H
#define _LIBCUDACXX___TYPE_TRAITS_IS_MEMBER_FUNCTION_POINTER_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/__type_traits/integral_constant.h>
#include <cuda/std/__type_traits/is_function.h>
#include <cuda/std/__type_traits/remove_cv.h>
#include <cuda/std/cstddef>

_LIBCUDACXX_BEGIN_NAMESPACE_STD

#if defined(_LIBCUDACXX_IS_MEMBER_FUNCTION_POINTER) && !defined(_LIBCUDACXX_USE_IS_MEMBER_FUNCTION_POINTER_FALLBACK)

template <class _Tp>
struct _CCCL_TYPE_VISIBILITY_DEFAULT is_member_function_pointer
    : public integral_constant<bool, _LIBCUDACXX_IS_MEMBER_FUNCTION_POINTER(_Tp)>
{};

#  if _CCCL_STD_VER > 2011 && !defined(_LIBCUDACXX_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCUDACXX_INLINE_VAR constexpr bool is_member_function_pointer_v = _LIBCUDACXX_IS_MEMBER_FUNCTION_POINTER(_Tp);
#  endif

#else

template <class _Tp>
struct __libcpp_is_member_pointer
{
  enum
  {
    __is_member = false,
    __is_func   = false,
    __is_obj    = false
  };
};
template <class _Tp, class _Up>
struct __libcpp_is_member_pointer<_Tp _Up::*>
{
  enum
  {
    __is_member = true,
    __is_func   = is_function<_Tp>::value,
    __is_obj    = !__is_func,
  };
};

template <class _Tp>
struct _CCCL_TYPE_VISIBILITY_DEFAULT is_member_function_pointer
    : public integral_constant<bool, __libcpp_is_member_pointer<__remove_cv_t<_Tp>>::__is_func>
{};

#  if _CCCL_STD_VER > 2011 && !defined(_LIBCUDACXX_HAS_NO_VARIABLE_TEMPLATES)
template <class _Tp>
_LIBCUDACXX_INLINE_VAR constexpr bool is_member_function_pointer_v = is_member_function_pointer<_Tp>::value;
#  endif

#endif // defined(_LIBCUDACXX_IS_MEMBER_FUNCTION_POINTER) &&
       // !defined(_LIBCUDACXX_USE_IS_MEMBER_FUNCTION_POINTER_FALLBACK)

_LIBCUDACXX_END_NAMESPACE_STD

#endif // _LIBCUDACXX___TYPE_TRAITS_IS_MEMBER_FUNCTION_POINTER_H
