//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___TYPE_TRAITS_ADD_POINTER_H
#define _LIBCPP___TYPE_TRAITS_ADD_POINTER_H

#include <__config>
#include <__type_traits/is_referenceable.h>
#include <__type_traits/is_same.h>
#include <__type_traits/is_void.h>
#include <__type_traits/remove_cv.h>
#include <__type_traits/remove_reference.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

#if __has_builtin(__add_pointer)

template <class _Tp>
using __add_pointer_t = __add_pointer(_Tp);

#else
template <class _Tp,
          bool = __libcpp_is_referenceable<_Tp>::value || is_void<_Tp>::value>
struct __add_pointer_impl {
  typedef _LIBCPP_NODEBUG __libcpp_remove_reference_t<_Tp>* type;
};
template <class _Tp> struct __add_pointer_impl<_Tp, false>
    {typedef _LIBCPP_NODEBUG _Tp type;};

template <class _Tp>
using __add_pointer_t = typename __add_pointer_impl<_Tp>::type;

#endif // __has_builtin(__add_pointer)

template <class _Tp>
struct add_pointer {
  using type _LIBCPP_NODEBUG = __add_pointer_t<_Tp>;
};

#if _LIBCPP_STD_VER > 11
template <class _Tp> using add_pointer_t = __add_pointer_t<_Tp>;
#endif

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___TYPE_TRAITS_ADD_POINTER_H