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| // RUN: %clang_cc1 -fsyntax-only -triple %itanium_abi_triple -verify %s -std=c++11
// RUN: %clang_cc1 -fsyntax-only -triple %ms_abi_triple -verify %s -std=c++11
namespace T1 {
class A {
virtual int f(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual void f(); // expected-error{{virtual function 'f' has a different return type ('void') than the function it overrides (which has return type 'int')}}
};
}
namespace T2 {
struct a { };
struct b { };
class A {
virtual a* f(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual b* f(); // expected-error{{return type of virtual function 'f' is not covariant with the return type of the function it overrides ('T2::b *' is not derived from 'T2::a *')}}
};
}
namespace T3 {
struct a { };
struct b : private a { }; // expected-note{{declared private here}}
class A {
virtual a* f(); // FIXME: desired-note{{overridden virtual function is here}}
};
class B : A {
virtual b* f(); // expected-error{{invalid covariant return for virtual function: 'T3::a' is a private base class of 'T3::b'}}
};
}
namespace T4 {
struct a { };
struct a1 : a { };
struct b : a, a1 { }; // expected-warning{{direct base 'T4::a' is inaccessible due to ambiguity:\n struct T4::b -> struct T4::a\n struct T4::b -> struct T4::a1 -> struct T4::a}}
class A {
virtual a* f(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual b* f(); // expected-error{{return type of virtual function 'f' is not covariant with the return type of the function it overrides (ambiguous conversion from derived class 'T4::b' to base class 'T4::a':\n\
struct T4::b -> struct T4::a\n\
struct T4::b -> struct T4::a1 -> struct T4::a)}}
};
}
namespace T5 {
struct a { };
class A {
virtual a* const f();
virtual a* const g(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual a* const f();
virtual a* g(); // expected-error{{return type of virtual function 'g' is not covariant with the return type of the function it overrides ('T5::a *' has different qualifiers than 'T5::a *const')}}
};
}
namespace T6 {
struct a { };
class A {
virtual const a* f();
virtual a* g(); // expected-note{{overridden virtual function is here}}
};
class B : A {
virtual a* f();
virtual const a* g(); // expected-error{{return type of virtual function 'g' is not covariant with the return type of the function it overrides (class type 'const T6::a *' is more qualified than class type 'T6::a *'}}
};
}
namespace T7 {
struct a { };
struct b { };
class A {
a* f();
};
class B : A {
virtual b* f();
};
}
namespace T8 {
struct a { };
struct b; // expected-note {{forward declaration of 'T8::b'}}
class A {
virtual a *f();
};
class B : A {
b* f(); // expected-error {{return type of virtual function 'f' is not covariant with the return type of the function it overrides ('T8::b' is incomplete)}}
};
}
namespace T9 {
struct a { };
template<typename T> struct b : a {
int a[sizeof(T) ? -1 : -1]; // expected-error {{array with a negative size}}
};
class A {
virtual a *f();
};
class B : A {
virtual b<int> *f(); // expected-note {{in instantiation of template class 'T9::b<int>' requested here}}
};
}
// PR5656
class X0 {
virtual void f0();
};
class X1 : public X0 {
void f0() = 0;
};
template <typename Base>
struct Foo : Base {
void f(int) = 0; // expected-error{{not virtual and cannot be declared pure}}
};
struct Base1 { virtual void f(int); };
struct Base2 { };
void test() {
(void)sizeof(Foo<Base1>);
(void)sizeof(Foo<Base2>); // expected-note{{instantiation}}
}
template<typename Base>
struct Foo2 : Base {
template<typename T> int f(T);
};
void test2() {
Foo2<Base1> f1;
Foo2<Base2> f2;
f1.f(17);
f2.f(17);
};
struct Foo3 {
virtual void f(int) = 0; // expected-note{{unimplemented pure virtual method}}
};
template<typename T>
struct Bar3 : Foo3 {
void f(T);
};
void test3() {
Bar3<int> b3i; // okay
Bar3<float> b3f; // expected-error{{is an abstract class}}
}
// 5920
namespace PR5920 {
class Base {};
template <typename T>
class Derived : public Base {};
class Foo {
public:
virtual Base* Method();
};
class Bar : public Foo {
public:
virtual Derived<int>* Method();
};
}
// Look through template types and typedefs to see whether return types are
// pointers or references.
namespace PR6110 {
class Base {};
class Derived : public Base {};
typedef Base* BaseP;
typedef Derived* DerivedP;
class X { virtual BaseP f(); };
class X1 : public X { virtual DerivedP f(); };
template <typename T> class Y { virtual T f(); };
template <typename T1, typename T> class Y1 : public Y<T> { virtual T1 f(); };
Y1<Derived*, Base*> y;
}
// Defer checking for covariance if either return type is dependent.
namespace type_dependent_covariance {
struct B {};
template <int N> struct TD : public B {};
template <> struct TD<1> {};
template <int N> struct TB {};
struct D : public TB<0> {};
template <int N> struct X {
virtual B* f1(); // expected-note{{overridden virtual function is here}}
virtual TB<N>* f2(); // expected-note{{overridden virtual function is here}}
};
template <int N, int M> struct X1 : X<N> {
virtual TD<M>* f1(); // expected-error{{return type of virtual function 'f1' is not covariant with the return type of the function it overrides ('TD<1> *'}}
virtual D* f2(); // expected-error{{return type of virtual function 'f2' is not covariant with the return type of the function it overrides ('type_dependent_covariance::D *' is not derived from 'TB<1> *')}}
};
X1<0, 0> good;
X1<0, 1> bad_derived; // expected-note{{instantiation}}
X1<1, 0> bad_base; // expected-note{{instantiation}}
}
namespace T10 {
struct A { };
struct B : A { };
struct C {
virtual A&& f();
};
struct D : C {
virtual B&& f();
};
};
namespace T11 {
struct A { };
struct B : A { };
struct C {
virtual A& f(); // expected-note {{overridden virtual function is here}}
};
struct D : C {
virtual B&& f(); // expected-error {{virtual function 'f' has a different return type ('T11::B &&') than the function it overrides (which has return type 'T11::A &')}}
};
};
namespace T12 {
struct A { };
struct B : A { };
struct C {
virtual A&& f(); // expected-note {{overridden virtual function is here}}
};
struct D : C {
virtual B& f(); // expected-error {{virtual function 'f' has a different return type ('T12::B &') than the function it overrides (which has return type 'T12::A &&')}}
};
};
namespace PR8168 {
class A {
public:
virtual void foo() {} // expected-note{{overridden virtual function is here}}
};
class B : public A {
public:
static void foo() {} // expected-error{{'static' member function 'foo' overrides a virtual function}}
};
}
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