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 // UNSUPPORTED: c++03, c++11, c++14, c++17
10 // UNSUPPORTED: libcpp-no-concepts
11 
12 // template<class T>
13 // concept unsigned_integral = // see below
14 
15 #include <concepts>
16 #include <type_traits>
17 
18 #include "arithmetic.h"
19 
20 template <typename T>
21 constexpr bool CheckUnsignedIntegralQualifiers() {
22   constexpr bool result = std::unsigned_integral<T>;
23   static_assert(std::unsigned_integral<const T> == result);
24   static_assert(std::unsigned_integral<volatile T> == result);
25   static_assert(std::unsigned_integral<const volatile T> == result);
26 
27   static_assert(!std::unsigned_integral<T&>);
28   static_assert(!std::unsigned_integral<const T&>);
29   static_assert(!std::unsigned_integral<volatile T&>);
30   static_assert(!std::unsigned_integral<const volatile T&>);
31 
32   static_assert(!std::unsigned_integral<T&&>);
33   static_assert(!std::unsigned_integral<const T&&>);
34   static_assert(!std::unsigned_integral<volatile T&&>);
35   static_assert(!std::unsigned_integral<const volatile T&&>);
36 
37   static_assert(!std::unsigned_integral<T*>);
38   static_assert(!std::unsigned_integral<const T*>);
39   static_assert(!std::unsigned_integral<volatile T*>);
40   static_assert(!std::unsigned_integral<const volatile T*>);
41 
42   static_assert(!std::unsigned_integral<T (*)()>);
43   static_assert(!std::unsigned_integral<T (&)()>);
44   static_assert(!std::unsigned_integral<T(&&)()>);
45 
46   return result;
47 }
48 
49 // standard unsigned types
50 static_assert(CheckUnsignedIntegralQualifiers<unsigned char>());
51 static_assert(CheckUnsignedIntegralQualifiers<unsigned short>());
52 static_assert(CheckUnsignedIntegralQualifiers<unsigned int>());
53 static_assert(CheckUnsignedIntegralQualifiers<unsigned long>());
54 static_assert(CheckUnsignedIntegralQualifiers<unsigned long long>());
55 
56 // Whether bool and character types are signed or unsigned is impl-defined
57 static_assert(CheckUnsignedIntegralQualifiers<wchar_t>() ==
58               !std::is_signed_v<wchar_t>);
59 static_assert(CheckUnsignedIntegralQualifiers<bool>() ==
60               !std::is_signed_v<bool>);
61 static_assert(CheckUnsignedIntegralQualifiers<char>() ==
62               !std::is_signed_v<char>);
63 static_assert(CheckUnsignedIntegralQualifiers<char8_t>() ==
64               !std::is_signed_v<char8_t>);
65 static_assert(CheckUnsignedIntegralQualifiers<char16_t>() ==
66               !std::is_signed_v<char16_t>);
67 static_assert(CheckUnsignedIntegralQualifiers<char32_t>() ==
68               !std::is_signed_v<char32_t>);
69 
70 // extended integers
71 #ifndef _LIBCPP_HAS_NO_INT128
72 static_assert(CheckUnsignedIntegralQualifiers<__uint128_t>());
73 static_assert(!CheckUnsignedIntegralQualifiers<__int128_t>());
74 #endif
75 
76 // integer types that aren't unsigned integrals
77 static_assert(!CheckUnsignedIntegralQualifiers<signed char>());
78 static_assert(!CheckUnsignedIntegralQualifiers<short>());
79 static_assert(!CheckUnsignedIntegralQualifiers<int>());
80 static_assert(!CheckUnsignedIntegralQualifiers<long>());
81 static_assert(!CheckUnsignedIntegralQualifiers<long long>());
82 
83 static_assert(!std::unsigned_integral<void>);
84 static_assert(!CheckUnsignedIntegralQualifiers<float>());
85 static_assert(!CheckUnsignedIntegralQualifiers<double>());
86 static_assert(!CheckUnsignedIntegralQualifiers<long double>());
87 
88 static_assert(!CheckUnsignedIntegralQualifiers<ClassicEnum>());
89 static_assert(!CheckUnsignedIntegralQualifiers<ScopedEnum>());
90 static_assert(!CheckUnsignedIntegralQualifiers<EmptyStruct>());
91 static_assert(!CheckUnsignedIntegralQualifiers<int EmptyStruct::*>());
92 static_assert(!CheckUnsignedIntegralQualifiers<int (EmptyStruct::*)()>());
93 
94 static_assert(CheckSubsumption(0));
95 static_assert(CheckSubsumption(0U));
96 
97 int main(int, char**) { return 0; }
98