1 // RUN: %clang_cc1 -std=c++2a -verify %s
2 
3 struct A {
4   int x;
5   int &y; // expected-note 7{{reference member 'y' declared here}}
6 
7   bool operator==(const A&) const = default; // expected-error {{cannot default 'operator==' in class 'A' with reference member}}
8   bool operator!=(const A&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator!=' in class 'A' with reference member}}
9 
10   bool operator<=>(const A&) const = default; // expected-error {{cannot default 'operator<=>' in class 'A' with reference member}}
11   bool operator<(const A&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<' in class 'A' with reference member}}
12   bool operator<=(const A&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<=' in class 'A' with reference member}}
13   bool operator>(const A&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator>' in class 'A' with reference member}}
14   bool operator>=(const A&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator>=' in class 'A' with reference member}}
15 };
16 
17 struct B {
18   struct {
19     int x;
20     int &y; // expected-note 7{{reference member 'y' declared here}}
21   };
22 
23   bool operator==(const B&) const = default; // expected-error {{cannot default 'operator==' in class 'B' with reference member}}
24   bool operator!=(const B&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator!=' in class 'B' with reference member}}
25 
26   bool operator<=>(const B&) const = default; // expected-error {{cannot default 'operator<=>' in class 'B' with reference member}}
27   bool operator<(const B&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<' in class 'B' with reference member}}
28   bool operator<=(const B&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<=' in class 'B' with reference member}}
29   bool operator>(const B&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator>' in class 'B' with reference member}}
30   bool operator>=(const B&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator>=' in class 'B' with reference member}}
31 };
32 
33 union C {
34   int a;
35 
36   bool operator==(const C&) const = default; // expected-error {{cannot default 'operator==' in union 'C'}}
37   bool operator!=(const C&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator!=' in union 'C'}}
38 
39   bool operator<=>(const C&) const = default; // expected-error {{cannot default 'operator<=>' in union 'C'}}
40   bool operator<(const C&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<' in union 'C'}}
41   bool operator<=(const C&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<=' in union 'C'}}
42   bool operator>(const C&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator>' in union 'C'}}
43   bool operator>=(const C&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator>=' in union 'C'}}
44 };
45 
46 struct D {
47   union {
48     int a;
49   };
50 
51   bool operator==(const D&) const = default; // expected-error {{cannot default 'operator==' in union-like class 'D'}}
52   bool operator!=(const D&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator!=' in union-like class 'D'}}
53 
54   bool operator<=>(const D&) const = default; // expected-error {{cannot default 'operator<=>' in union-like class 'D'}}
55   bool operator<(const D&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<' in union-like class 'D'}}
56   bool operator<=(const D&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<=' in union-like class 'D'}}
57   bool operator>(const D&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator>' in union-like class 'D'}}
58   bool operator>=(const D&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator>=' in union-like class 'D'}}
59 };
60 
61 union E {
62   bool operator==(const E&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator==' in union 'E' despite it having no variant members}}
63   bool operator!=(const E&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator!=' in union 'E'}}
64 
65   bool operator<=>(const E&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<=>' in union 'E' despite it having no variant members}}
66   bool operator<(const E&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<' in union 'E'}}
67   bool operator<=(const E&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator<=' in union 'E'}}
68   bool operator>(const E&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator>' in union 'E'}}
69   bool operator>=(const E&) const = default; // expected-warning {{ISO C++2a does not allow defaulting 'operator>=' in union 'E'}}
70 };
71