單虛擬繼承
class Base
{
public:
virtual void fun1()
{
cout << "Base::func1()" << endl;
}
virtual void fun2()
{
cout << "Base::func2()" << endl;
}
private:
int b;
};
class Derive : virtual public Base
{
public:
virtual void fun1()
{
cout << "Derive::func1()" << endl;
}
virtual void fun3()
{
cout << "Derive::func3()" << endl;
}
void fun4()
{
cout << "Derive::func4()" << endl;
}
private:
int d;
};
//1 > class Derive size(20) :
//1 > +-- -
//1 > 0 | {vfptr}
//1 > 4 | {vbptr}
//1 > 8 | d
//1 > +-- -
//1 > +-- - (virtual base Base)
//1 > 12 | {vfptr}
//1 > 16 | b
//1 > +-- -
//1 >
//1 > Derive::$vftable@Derive@:
//1 > | &Derive_meta
//1 > | 0
//1 > 0 | &Derive::fun3
//1 >
//1 > Derive::$vbtable@:
//1 > 0 | -4
//1 > 1 | 8 (Derived(Derive + 4)Base)
//1 >
//1 > Derive::$vftable@Base@:
//1 > | -12
//1 > 0 | &Derive::fun1
//1 > 1 | &Base::fun2
//1 >
//1 > Derive::fun1 this adjustor: 12
//1 > Derive::fun3 this adjustor: 0
//1 > vbi: class offset o.vbptr o.vbte fVtorDisp
//1 > Base 12 4 4 0
//1 >
多虛擬繼承
class Base1
{
public:
virtual void fun1()
{
cout << "Base1::fun1" << endl;
}
virtual void fun2()
{
cout << "Base1::fun2" << endl;
}
private:
int b1;
};
class Base2
{
public:
virtual void fun1()
{
cout << "Base2::fun1" << endl;
}
virtual void fun2()
{
cout << "Base2::fun2" << endl;
}
private:
int b2;
};
class DeriveA : virtual public Base1, virtual public Base2
{
public:
virtual void fun1()
{
cout << "DeriveA::fun1" << endl;
}
virtual void fun3()
{
cout << "DeriveA::fun3" << endl;
}
private:
int d1;
};
//1 > class DeriveA size(28) :
//1 > +-- -
//1 > 0 | {vfptr}
//1 > 4 | {vbptr}
//1 > 8 | d1
//1 > +-- -
//1 > +-- - (virtual base Base1)
//1 > 12 | {vfptr}
//1 > 16 | b1
//1 > +-- -
//1 > +-- - (virtual base Base2)
//1 > 20 | {vfptr}
//1 > 24 | b2
//1 > +-- -
//1 >
//1 > DeriveA::$vftable@DeriveA@:
//1 > | &DeriveA_meta
//1 > | 0
//1 > 0 | &DeriveA::fun3
//1 >
//1 > DeriveA::$vbtable@:
//1 > 0 | -4
//1 > 1 | 8 (DeriveAd(DeriveA + 4)Base1)
//1 > 2 | 16 (DeriveAd(DeriveA + 4)Base2)
//1 >
//1 > DeriveA::$vftable@Base1@:
//1 > | -12
//1 > 0 | &DeriveA::fun1
//1 > 1 | &Base1::fun2
//1 >
//1 > DeriveA::$vftable@Base2@:
//1 > | -20
//1 > 0 | &thunk: this -= 8; goto DeriveA::fun1
//1 > 1 | &Base2::fun2
//1 >
//1 > DeriveA::fun1 this adjustor: 12
//1 > DeriveA::fun3 this adjustor: 0
//1 > vbi: class offset o.vbptr o.vbte fVtorDisp
//1 > Base1 12 4 4 0
//1 > Base2 20 4 8 0
//1 >
菱形虛擬繼承
class Base
{
public:
virtual void func1()
{
cout << "Base::func1()" << endl;
}
virtual void func2()
{
cout << "Base::func2()" << endl;
}
private:
int b;
};
class Base1 : virtual public Base
{
public:
virtual void func1()
{
cout << "Base1::func1()" << endl;
}
virtual void func3()
{
cout << "Base1::func3()" << endl;
}
private:
int b1;
};
class Base2 :virtual public Base
{
public:
virtual void func1()
{
cout << "Base2::func2()" << endl;
}
virtual void func4()
{
cout << "Base2::func4()" << endl;
}
private:
int b2;
};
class Derive : virtual public Base1, virtual public Base2
{
public:
virtual void func1()
{
cout << "Derive::func1()" << endl;
}
virtual void func5()
{
cout << "Derive::func5()" << endl;
}
private:
int d;
};
//1 > class Derive size(44) :
//1 > +-- -
//1 > 0 | {vfptr}
//1 > 4 | {vbptr}
//1 > 8 | d
//1 > +-- -
//1 > +-- - (virtual base Base)
//1 > 12 | {vfptr}
//1 > 16 | b
//1 > +-- -
//1 > +-- - (virtual base Base1)
//1 > 20 | {vfptr}
//1 > 24 | {vbptr}
//1 > 28 | b1
//1 > +-- -
//1 > +-- - (virtual base Base2)
//1 > 32 | {vfptr}
//1 > 36 | {vbptr}
//1 > 40 | b2
//1 > +-- -
//1 >
//1 > Derive::$vftable@:
//1 > | &Derive_meta
//1 > | 0
//1 > 0 | &Derive::func5
//1 >
//1 > Derive::$vbtable@Derive@:
//1 > 0 | -4
//1 > 1 | 8 (Derived(Derive + 4)Base)
//1 > 2 | 16 (Derived(Derive + 4)Base1)
//1 > 3 | 28 (Derived(Derive + 4)Base2)
//1 >
//1 > Derive::$vftable@Base@:
//1 > | -12
//1 > 0 | &Derive::func1
//1 > 1 | &Base::func2
//1 >
//1 > Derive::$vftable@Base1@:
//1 > | -20
//1 > 0 | &Base1::func3
//1 >
//1 > Derive::$vbtable@Base1@:
//1 > 0 | -4
//1 > 1 | -12 (Derived(Base1 + 4)Base)
//1 >
//1 > Derive::$vftable@Base2@:
//1 > | -32
//1 > 0 | &Base2::func4
//1 >
//1 > Derive::$vbtable@Base2@:
//1 > 0 | -4
//1 > 1 | -24 (Derived(Base2 + 4)Base)
//1 >
//1 > Derive::func1 this adjustor: 12
//1 > Derive::func5 this adjustor: 0
//1 > vbi: class offset o.vbptr o.vbte fVtorDisp
//1 > Base 12 4 4 0
//1 > Base1 20 4 8 0
//1 > Base2 32 4 12 0
//1 >
