如何确定C++继承层次中的函数调用

  1 ```cpp
  2 
  3 
  4 //============================================================================
  5 // Name        : TS.cpp
  6 // Author      : jiudianren
  7 // Version     :
  8 // Copyright   : Your copyright notice
  9 // Description : Hello World in C++, Ansi-style
 10 //============================================================================
 11 
 12 #include <iostream>
 13 #include <functional>
 14 
 15 using namespace std;
 16 
 17 
 18 class A
 19 {
 20 protected:
 21     int m_data;
 22 public:
 23     A(int data = 0)
 24     {
 25         m_data = data;
 26     }
 27     int GetData()
 28     {
 29         return doGetData();
 30     }
 31     virtual int doGetData()
 32     {
 33         return m_data;
 34     }
 35 };
 36 
 37 
 38 
 39 class B: public A
 40 {
 41 protected:
 42     int m_data;
 43 public:
 44     B(int data = 1)
 45     {
 46         m_data = data;
 47     }
 48     int doGetData()
 49     {
 50         return m_data;
 51     }
 52 };
 53 
 54 
 55 class C: public B
 56 {
 57 protected:
 58     int m_data;
 59 public:
 60     C(int data = 2)
 61     {
 62         m_data = data;
 63     }
 64 
 65     int doGetData()
 66     {
 67         return m_data;
 68     }
 69 };
 70 
 71 void ref(C* & d)
 72 {
 73     cout<<d->GetData()<<endl;            //题1
 74     cout<<d->A::GetData()<<endl;         //题2
 75     cout<<d->B::GetData()<<endl;         //题3
 76     cout<<d->C::GetData()<<endl;         //题4
 77 
 78     cout<<d->doGetData()<<endl;          //题5
 79     cout<<d->A::doGetData()<<endl;       //题6
 80     cout<<d->B::doGetData()<<endl;       //题7
 81     cout<<d->C::doGetData()<<endl;       //题8
 82 }
 83 int main()
 84 {
 85     C c(10);
 86     cout<<c.GetData()<<endl;            //题1
 87     cout<<c.A::GetData()<<endl;         //题2
 88     cout<<c.B::GetData()<<endl;         //题3
 89     cout<<c.C::GetData()<<endl;         //题4
 90 
 91     cout<<c.doGetData()<<endl;          //题5
 92     cout<<c.A::doGetData()<<endl;       //题6
 93     cout<<c.B::doGetData()<<endl;       //题7
 94     cout<<c.C::doGetData()<<endl;       //题8
 95 
 96     cout<<"sssssssssss"<<endl;       //题8
 97     C *f=new C(11);
 98     C *d=f;
 99     cout<<d->GetData()<<endl;            //题1
100     cout<<d->A::GetData()<<endl;         //题2
101     cout<<d->B::GetData()<<endl;         //题3
102     cout<<d->C::GetData()<<endl;         //题4
103 
104     cout<<d->doGetData()<<endl;          //题5
105     cout<<d->A::doGetData()<<endl;       //题6
106     cout<<d->B::doGetData()<<endl;       //题7
107     cout<<d->C::doGetData()<<endl;       //题8
108 
109     cout<<"sssssssssss"<<endl;       //题8
110     ref(f);
111     return 0;
112 }
113 
114 
115 ```