2 u012533786 u012533786 于 2013.11.23 16:52 提问

c++虚基类二义性的问题

#include
using namespace std;
class A{
public:
A(int a):x(a){ cout<<"A constructor..."<<x<<endl; }
int f(){return ++x;}
~A(){cout<<"destructor A..."<<endl;}
private:
int x;
};
class B:public virtual A{
private:
int y;
A Aobj;
public:
B(int a,int b,int c):A(a),y(c),Aobj(c){ cout<<"B constructor..."<<y<<endl;}
int f(){
A::f();
Aobj.f();
return ++y;
}
void display(){ cout<<A::f()<<"\t"<<Aobj.f()<<"\t"<<f()<<endl; }
~B(){cout<<"destructor B..."<<endl;}

};
class C:public B{
public:
C(int a,int b,int c):B(a,b,c),A(0){ cout<<"C constructor..."<<endl;}
};
class D:public C,public virtual A{
public:
D(int a,int b,int c):C(a,b,c),A(c){ cout<<"D constructor..."<<endl;}
~D(){cout<<"destructor D...."<<endl;}
};
int main()
{
D d(7,8,9);
d.f();
d.display();
return 0;
}

main 中d.f(); 语句调用时 D类中有公有继承B类中的f();方法 和公有虚继承A 中的f();为什么不会产生二义性; 谢谢

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