1// RUN: %check_clang_tidy -std=c++20 %s modernize-use-nullptr %t -- -- -DGCC
2// RUN: %check_clang_tidy -std=c++20 %s modernize-use-nullptr %t -- -- -DCLANG
3
4namespace std {
5class strong_ordering;
6
7// Mock how STD defined unspecified parameters for the operators below.
8#ifdef CLANG
9struct _CmpUnspecifiedParam {
10 consteval
11 _CmpUnspecifiedParam(int _CmpUnspecifiedParam::*) noexcept {}
12};
13
14#define UNSPECIFIED_TYPE _CmpUnspecifiedParam
15#endif
16
17#ifdef GCC
18namespace __cmp_cat {
19 struct __unspec {
20 constexpr __unspec(__unspec*) noexcept { }
21 };
22}
23
24#define UNSPECIFIED_TYPE __cmp_cat::__unspec
25#endif
26
27struct strong_ordering {
28 signed char value;
29
30 friend constexpr bool operator==(strong_ordering v,
31 UNSPECIFIED_TYPE) noexcept {
32 return v.value == 0;
33 }
34 friend constexpr bool operator<(strong_ordering v,
35 UNSPECIFIED_TYPE) noexcept {
36 return v.value < 0;
37 }
38 friend constexpr bool operator>(strong_ordering v,
39 UNSPECIFIED_TYPE) noexcept {
40 return v.value > 0;
41 }
42 friend constexpr bool operator>=(strong_ordering v,
43 UNSPECIFIED_TYPE) noexcept {
44 return v.value >= 0;
45 }
46 static const strong_ordering equal, greater, less;
47};
48
49constexpr strong_ordering strong_ordering::equal = {.value: 0};
50constexpr strong_ordering strong_ordering::greater = {.value: 1};
51constexpr strong_ordering strong_ordering::less = {.value: -1};
52} // namespace std
53
54class A {
55 int a;
56public:
57 auto operator<=>(const A &other) const = default;
58 // CHECK-FIXES: auto operator<=>(const A &other) const = default;
59};
60
61void test_cxx_rewritten_binary_ops() {
62 A a1, a2;
63 bool result;
64 // should not change next line to (a1 nullptr a2)
65 result = (a1 < a2);
66 // CHECK-FIXES: result = (a1 < a2);
67 // should not change next line to (a1 nullptr a2)
68 result = (a1 >= a2);
69 // CHECK-FIXES: result = (a1 >= a2);
70 int *ptr = 0;
71 // CHECK-FIXES: int *ptr = nullptr;
72 result = (a1 > (ptr == 0 ? a1 : a2));
73 // CHECK-FIXES: result = (a1 > (ptr == nullptr ? a1 : a2));
74 result = (a1 > ((a1 > (ptr == 0 ? a1 : a2)) ? a1 : a2));
75 // CHECK-FIXES: result = (a1 > ((a1 > (ptr == nullptr ? a1 : a2)) ? a1 : a2));
76}
77
78void testValidZero() {
79 A a1, a2;
80 auto result = a1 <=> a2;
81 if (result < 0) {}
82 // CHECK-FIXES: if (result < 0) {}
83}
84
85template<class T1, class T2>
86struct P {
87 T1 x1;
88 T2 x2;
89 friend auto operator<=>(const P&, const P&) = default;
90 // CHECK-FIXES: friend auto operator<=>(const P&, const P&) = default;
91};
92
93bool foo(P<int,int> x, P<int, int> y) { return x < y; }
94// CHECK-FIXES: bool foo(P<int,int> x, P<int, int> y) { return x < y; }
95

source code of clang-tools-extra/test/clang-tidy/checkers/modernize/use-nullptr-cxx20.cpp