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_MAKE_UNSIGNED_H
10 #define _LIBCPP___TYPE_TRAITS_MAKE_UNSIGNED_H
11
12 #include <__config>
13 #include <__type_traits/conditional.h>
14 #include <__type_traits/copy_cv.h>
15 #include <__type_traits/is_enum.h>
16 #include <__type_traits/is_integral.h>
17 #include <__type_traits/is_unsigned.h>
18 #include <__type_traits/nat.h>
19 #include <__type_traits/remove_cv.h>
20 #include <__type_traits/type_list.h>
21
22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23 # pragma GCC system_header
24 #endif
25
26 _LIBCPP_BEGIN_NAMESPACE_STD
27
28 #if __has_builtin(__make_unsigned)
29
30 template <class _Tp>
31 using __make_unsigned_t = __make_unsigned(_Tp);
32
33 #else
34 // clang-format off
35 typedef __type_list<unsigned char,
36 __type_list<unsigned short,
37 __type_list<unsigned int,
38 __type_list<unsigned long,
39 __type_list<unsigned long long,
40 # ifndef _LIBCPP_HAS_NO_INT128
41 __type_list<__uint128_t,
42 # endif
43 __nat
44 # ifndef _LIBCPP_HAS_NO_INT128
45 >
46 # endif
47 > > > > > __unsigned_types;
48 // clang-format on
49
50 template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value>
51 struct __make_unsigned{};
52
53 template <class _Tp>
54 struct __make_unsigned<_Tp, true> {
55 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type;
56 };
57
58 // clang-format off
59 template <> struct __make_unsigned<bool, true> {};
60 template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;};
61 template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;};
62 template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;};
63 template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;};
64 template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;};
65 template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;};
66 template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;};
67 template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;};
68 # ifndef _LIBCPP_HAS_NO_INT128
69 template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;};
70 template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;};
71 # endif
72 // clang-format on
73
74 template <class _Tp>
75 using __make_unsigned_t = __copy_cv_t<_Tp, typename __make_unsigned<__remove_cv_t<_Tp> >::type>;
76
77 #endif // __has_builtin(__make_unsigned)
78
79 template <class _Tp>
80 struct make_unsigned {
81 using type _LIBCPP_NODEBUG = __make_unsigned_t<_Tp>;
82 };
83
84 #if _LIBCPP_STD_VER >= 14
85 template <class _Tp>
86 using make_unsigned_t = __make_unsigned_t<_Tp>;
87 #endif
88
89 #ifndef _LIBCPP_CXX03_LANG
90 template <class _Tp>
__to_unsigned_like(_Tp __x)91 _LIBCPP_HIDE_FROM_ABI constexpr __make_unsigned_t<_Tp> __to_unsigned_like(_Tp __x) noexcept {
92 return static_cast<__make_unsigned_t<_Tp> >(__x);
93 }
94 #endif
95
96 template <class _Tp, class _Up>
97 using __copy_unsigned_t = __conditional_t<is_unsigned<_Tp>::value, __make_unsigned_t<_Up>, _Up>;
98
99 _LIBCPP_END_NAMESPACE_STD
100
101 #endif // _LIBCPP___TYPE_TRAITS_MAKE_UNSIGNED_H
102