89 lines
4.2 KiB
C++
89 lines
4.2 KiB
C++
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// RUN: %clang_cc1 -verify=expected,pre20 %s -std=c++11
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// RUN: %clang_cc1 -verify=expected,pre20 %s -std=c++17
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// RUN: %clang_cc1 -verify=expected %s -std=c++20
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// A function that is explicitly defaulted shall
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struct A {
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// -- be a special member function [C++20: or a comparison operator function],
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A(int) = default;
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#if __cplusplus <= 201703L
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// expected-error@-2 {{only special member functions may be defaulted}}
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#else
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// expected-error@-4 {{only special member functions and comparison operators may be defaulted}}
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#endif
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A(A) = default; // expected-error {{must pass its first argument by reference}}
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void f(A) = default; // expected-error-re {{only special member functions{{( and comparison operators)?}} may be defaulted}}
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bool operator==(const A&) const = default; // pre20-warning {{defaulted comparison operators are a C++20 extension}}
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bool operator!=(const A&) const = default; // pre20-warning {{defaulted comparison operators are a C++20 extension}}
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bool operator<(const A&) const = default; // pre20-error {{only special member functions may be defaulted}}
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bool operator>(const A&) const = default; // pre20-error {{only special member functions may be defaulted}}
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bool operator<=(const A&) const = default; // pre20-error {{only special member functions may be defaulted}}
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bool operator>=(const A&) const = default; // pre20-error {{only special member functions may be defaulted}}
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bool operator<=>(const A&) const = default; // pre20-error 1+{{}} pre20-warning {{'<=>' is a single token in C++20}}
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A operator+(const A&) const = default; // expected-error-re {{only special member functions{{( and comparison operators)?}} may be defaulted}}
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// -- have the same declared function type as if it had been implicitly
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// declared
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void operator=(const A &) = default; // expected-error {{must return 'A &'}}
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A(...) = default;
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A(const A &, ...) = default;
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A &operator=(const A&) const = default;
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A &operator=(A) const = default; // expected-error {{must be an lvalue refe}}
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#if __cplusplus <= 201703L
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// expected-error@-5 {{cannot be variadic}}
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// expected-error@-5 {{cannot be variadic}}
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// expected-error@-5 {{may not have 'const'}}
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// expected-error@-5 {{may not have 'const'}}
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#else
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// expected-warning@-10 {{implicitly deleted}} expected-note@-10 {{declared type does not match the type of an implicit default constructor}}
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// expected-warning@-10 {{implicitly deleted}} expected-note@-10 {{declared type does not match the type of an implicit copy constructor}}
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// expected-warning@-10 {{implicitly deleted}} expected-note@-10 {{declared type does not match the type of an implicit copy assignment}}
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#endif
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// (except for possibly differing ref-qualifiers
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A &operator=(A &&) & = default;
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// and except that in the case of a copy constructor or copy assignment
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// operator, the parameter type may be "reference to non-const T")
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A(A &) = default;
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A &operator=(A &) = default;
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// -- not have default arguments
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A(double = 0.0) = default; // expected-error {{cannot have default arguments}}
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A(const A & = 0) = default; // expected-error {{cannot have default arguments}}
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};
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struct A2 {
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A2(...);
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A2(const A2 &, ...);
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A2 &operator=(const A2&) const;
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};
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A2::A2(...) = default; // expected-error {{cannot be variadic}}
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A2::A2(const A2&, ...) = default; // expected-error {{cannot be variadic}}
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A2 &A2::operator=(const A2&) const = default; // expected-error {{may not have 'const'}}
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struct B {
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B(B&);
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B &operator=(B&);
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};
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struct C : B {
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C(const C&) = default;
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C &operator=(const C&) = default;
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#if __cplusplus <= 201703L
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// expected-error@-3 {{is const, but a member or base requires it to be non-const}}
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// expected-error@-3 {{is const, but a member or base requires it to be non-const}}
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#else
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// expected-warning@-6 {{implicitly deleted}} expected-note@-6 {{type does not match}}
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// expected-warning@-6 {{implicitly deleted}} expected-note@-6 {{type does not match}}
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#endif
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};
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struct D : B { // expected-note 2{{base class}}
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D(const D&);
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D &operator=(const D&);
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};
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D::D(const D&) = default; // expected-error {{would delete}} expected-error {{is const, but}}
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D &D::operator=(const D&) = default; // expected-error {{would delete}} expected-error {{is const, but}}
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