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1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___TYPE_TRAITS_REMOVE_POINTER_H
10#define _LIBCPP___TYPE_TRAITS_REMOVE_POINTER_H
11
12#include <__config>
13
14#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
15# pragma GCC system_header
16#endif
17
18_LIBCPP_BEGIN_NAMESPACE_STD
19
20#if !defined(_LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS) && __has_builtin(__remove_pointer)
21template <class _Tp>
22struct _LIBCPP_NO_SPECIALIZATIONS remove_pointer {
23 using type _LIBCPP_NODEBUG = __remove_pointer(_Tp);
24};
25
26# ifdef _LIBCPP_COMPILER_GCC
27template <class _Tp>
28using __remove_pointer_t _LIBCPP_NODEBUG = typename remove_pointer<_Tp>::type;
29# else
30template <class _Tp>
31using __remove_pointer_t _LIBCPP_NODEBUG = __remove_pointer(_Tp);
32# endif
33#else
34// clang-format off
35template <class _Tp> struct remove_pointer {using type _LIBCPP_NODEBUG = _Tp;};
36template <class _Tp> struct remove_pointer<_Tp*> {using type _LIBCPP_NODEBUG = _Tp;};
37template <class _Tp> struct remove_pointer<_Tp* const> {using type _LIBCPP_NODEBUG = _Tp;};
38template <class _Tp> struct remove_pointer<_Tp* volatile> {using type _LIBCPP_NODEBUG = _Tp;};
39template <class _Tp> struct remove_pointer<_Tp* const volatile> {using type _LIBCPP_NODEBUG = _Tp;};
40// clang-format on
41
42template <class _Tp>
43using __remove_pointer_t = typename remove_pointer<_Tp>::type;
44#endif // !defined(_LIBCPP_WORKAROUND_OBJCXX_COMPILER_INTRINSICS) && __has_builtin(__remove_pointer)
45
46#if _LIBCPP_STD_VER >= 14
47template <class _Tp>
48using remove_pointer_t = __remove_pointer_t<_Tp>;
49#endif
50
51_LIBCPP_END_NAMESPACE_STD
52
53#endif // _LIBCPP___TYPE_TRAITS_REMOVE_POINTER_H
54

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source code of libcxx/include/__type_traits/remove_pointer.h