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 
11 // template<class T>
12 // concept signed_integral = // see below
13 
14 #include <concepts>
15 #include <type_traits>
16 
17 #include "arithmetic.h"
18 #include "test_macros.h"
19 
20 template <typename T>
CheckSignedIntegralQualifiers()21 constexpr bool CheckSignedIntegralQualifiers() {
22   constexpr bool result = std::signed_integral<T>;
23   static_assert(std::signed_integral<const T> == result);
24   static_assert(std::signed_integral<volatile T> == result);
25   static_assert(std::signed_integral<const volatile T> == result);
26 
27   static_assert(!std::signed_integral<T&>);
28   static_assert(!std::signed_integral<const T&>);
29   static_assert(!std::signed_integral<volatile T&>);
30   static_assert(!std::signed_integral<const volatile T&>);
31 
32   static_assert(!std::signed_integral<T&&>);
33   static_assert(!std::signed_integral<const T&&>);
34   static_assert(!std::signed_integral<volatile T&&>);
35   static_assert(!std::signed_integral<const volatile T&&>);
36 
37   static_assert(!std::signed_integral<T*>);
38   static_assert(!std::signed_integral<const T*>);
39   static_assert(!std::signed_integral<volatile T*>);
40   static_assert(!std::signed_integral<const volatile T*>);
41 
42   static_assert(!std::signed_integral<T (*)()>);
43   static_assert(!std::signed_integral<T (&)()>);
44   static_assert(!std::signed_integral<T(&&)()>);
45 
46   return result;
47 }
48 
49 // standard signed integers
50 static_assert(CheckSignedIntegralQualifiers<signed char>());
51 static_assert(CheckSignedIntegralQualifiers<short>());
52 static_assert(CheckSignedIntegralQualifiers<int>());
53 static_assert(CheckSignedIntegralQualifiers<long>());
54 static_assert(CheckSignedIntegralQualifiers<long long>());
55 
56 // bool and character *may* be signed
57 static_assert(CheckSignedIntegralQualifiers<wchar_t>() ==
58               std::is_signed_v<wchar_t>);
59 static_assert(CheckSignedIntegralQualifiers<bool>() == std::is_signed_v<bool>);
60 static_assert(CheckSignedIntegralQualifiers<char>() == std::is_signed_v<char>);
61 static_assert(CheckSignedIntegralQualifiers<char8_t>() ==
62               std::is_signed_v<char8_t>);
63 static_assert(CheckSignedIntegralQualifiers<char16_t>() ==
64               std::is_signed_v<char16_t>);
65 static_assert(CheckSignedIntegralQualifiers<char32_t>() ==
66               std::is_signed_v<char32_t>);
67 
68 // integers that aren't signed integrals
69 static_assert(!CheckSignedIntegralQualifiers<unsigned char>());
70 static_assert(!CheckSignedIntegralQualifiers<unsigned short>());
71 static_assert(!CheckSignedIntegralQualifiers<unsigned int>());
72 static_assert(!CheckSignedIntegralQualifiers<unsigned long>());
73 static_assert(!CheckSignedIntegralQualifiers<unsigned long long>());
74 
75 // extended integers
76 #ifndef TEST_HAS_NO_INT128
77 static_assert(CheckSignedIntegralQualifiers<__int128_t>());
78 static_assert(!CheckSignedIntegralQualifiers<__uint128_t>());
79 #endif
80 
81 // types that aren't even integers shouldn't be signed integers!
82 static_assert(!std::signed_integral<void>);
83 static_assert(!CheckSignedIntegralQualifiers<float>());
84 static_assert(!CheckSignedIntegralQualifiers<double>());
85 static_assert(!CheckSignedIntegralQualifiers<long double>());
86 
87 static_assert(!CheckSignedIntegralQualifiers<ClassicEnum>());
88 static_assert(!CheckSignedIntegralQualifiers<ScopedEnum>());
89 static_assert(!CheckSignedIntegralQualifiers<EmptyStruct>());
90 static_assert(!CheckSignedIntegralQualifiers<int EmptyStruct::*>());
91 static_assert(!CheckSignedIntegralQualifiers<int (EmptyStruct::*)()>());
92 
93 static_assert(CheckSubsumption(0));
94 static_assert(CheckSubsumption(0U));
95 
main(int,char **)96 int main(int, char**) { return 0; }
97