| 1 | // RUN: %clang_cc1 -verify %s -std=c++11 |
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| 2 | // RUN: %clang_cc1 -verify %s -std=c++17 |
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| 3 | // RUN: %clang_cc1 -verify %s -std=c++2a |
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| 4 | |
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| 5 | // A function that is explicitly defaulted shall |
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| 6 | struct A { |
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| 7 | // -- be a special member function, |
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| 8 | A(int) = default; // expected-error {{only special member functions may be defaulted}} |
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| 9 | A(A) = default; // expected-error {{must pass its first argument by reference}} |
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| 10 | |
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| 11 | // -- have the same declared function type as if it had been implicitly |
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| 12 | // declared |
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| 13 | void operator=(const A &) = default; // expected-error {{must return 'A &'}} |
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| 14 | A(...) = default; |
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| 15 | A(const A &, ...) = default; |
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| 16 | A &operator=(const A&) const = default; |
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| 17 | A &operator=(A) const = default; // expected-error {{must be an lvalue refe}} |
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| 18 | #if __cplusplus <= 201703L |
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| 19 | // expected-error@-5 {{cannot be variadic}} |
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| 20 | // expected-error@-5 {{cannot be variadic}} |
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| 21 | // expected-error@-5 {{may not have 'const'}} |
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| 22 | // expected-error@-5 {{may not have 'const'}} |
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| 23 | #else |
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| 24 | // expected-warning@-10 {{implicitly deleted}} expected-note@-10 {{declared type does not match the type of an implicit default constructor}} |
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| 25 | // expected-warning@-10 {{implicitly deleted}} expected-note@-10 {{declared type does not match the type of an implicit copy constructor}} |
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| 26 | // expected-warning@-10 {{implicitly deleted}} expected-note@-10 {{declared type does not match the type of an implicit copy assignment}} |
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| 27 | #endif |
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| 28 | |
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| 29 | // (except for possibly differing ref-qualifiers |
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| 30 | A &operator=(A &&) & = default; |
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| 31 | |
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| 32 | // and except that in the case of a copy constructor or copy assignment |
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| 33 | // operator, the parameter type may be "reference to non-const T") |
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| 34 | A(A &) = default; |
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| 35 | A &operator=(A &) = default; |
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| 36 | |
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| 37 | // -- not have default arguments |
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| 38 | A(double = 0.0) = default; // expected-error {{cannot have default arguments}} |
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| 39 | A(const A & = 0) = default; // expected-error {{cannot have default arguments}} |
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| 40 | }; |
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| 41 | |
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| 42 | struct A2 { |
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| 43 | A2(...); |
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| 44 | A2(const A2 &, ...); |
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| 45 | A2 &operator=(const A2&) const; |
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| 46 | }; |
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| 47 | A2::A2(...) = default; // expected-error {{cannot be variadic}} |
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| 48 | A2::A2(const A2&, ...) = default; // expected-error {{cannot be variadic}} |
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| 49 | A2 &A2::operator=(const A2&) const = default; // expected-error {{may not have 'const'}} |
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| 50 | |
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| 51 | struct B { |
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| 52 | B(B&); |
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| 53 | B &operator=(B&); |
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| 54 | }; |
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| 55 | struct C : B { |
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| 56 | C(const C&) = default; |
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| 57 | C &operator=(const C&) = default; |
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| 58 | #if __cplusplus <= 201703L |
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| 59 | // expected-error@-3 {{is const, but a member or base requires it to be non-const}} |
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| 60 | // expected-error@-3 {{is const, but a member or base requires it to be non-const}} |
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| 61 | #else |
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| 62 | // expected-warning@-6 {{implicitly deleted}} expected-note@-6 {{type does not match}} |
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| 63 | // expected-warning@-6 {{implicitly deleted}} expected-note@-6 {{type does not match}} |
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| 64 | #endif |
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| 65 | }; |
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| 66 | |
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| 67 | struct D : B { // expected-note 2{{base class}} |
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| 68 | D(const D&); |
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| 69 | D &operator=(const D&); |
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| 70 | }; |
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| 71 | D::D(const D&) = default; // expected-error {{would delete}} expected-error {{is const, but}} |
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| 72 | D &D::operator=(const D&) = default; // expected-error {{would delete}} expected-error {{is const, but}} |
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| 73 | |
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