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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. class Base
  6. {
  7. public:
  8.     virtual void Fun_1(){}
  9.     virtual void Fun_2(){}
  10.     virtual void Fun_3(){}
  11. };
  12.  
  13. class BaseComp : public Base
  14. {
  15. public:
  16.     BaseComp():m_pBase(NULL){}
  17.     BaseComp(Base* pBase):m_pBase(pBase){}
  18.     virtual void Fun_1()
  19.     {
  20.         if(m_pBase)
  21.             m_pBase->Fun_1();
  22.     }
  23.     virtual void Fun_2()
  24.     {
  25.         if(m_pBase)
  26.             m_pBase->Fun_2();
  27.     }
  28.     virtual void Fun_3()
  29.     {
  30.         if(m_pBase)
  31.             m_pBase->Fun_3();
  32.     }
  33. protected:
  34.     Base* m_pBase;
  35. };
  36. class Derive_1 : public BaseComp
  37. {
  38. public:
  39.     Derive_1(){}
  40.     Derive_1(Base* pBase):BaseComp(pBase){}
  41.     virtual void Fun_1(){cout<<"Derive_1 Executed"<<endl;}
  42. };
  43.  
  44. class Derive_2 : public BaseComp
  45. {   
  46. public:
  47.     Derive_2(){}
  48.     Derive_2(Base* pBase):BaseComp(pBase){}
  49.     virtual void Fun_2(){cout<<"Derive_2 Executed"<<endl;}
  50. };
  51.  
  52. class Derive_3 : public BaseComp
  53. {
  54. public:
  55.     Derive_3(){}
  56.     Derive_3(Base* pBase):BaseComp(pBase){}
  57.     virtual void Fun_3(){cout<<"Derive_3 Executed"<<endl;}
  58. };
  59.  
  60.  
  61. int main() {
  62.  
  63.     Base* p1=new Derive_1(new Derive_2());
  64.     cout<<"p1:"<<endl;
  65.     p1->Fun_1();
  66.     p1->Fun_2();
  67.     p1->Fun_3();
  68.  
  69.     cout<<endl<<"p2:"<<endl;
  70.     Base* p2=new Derive_2(new Derive_3());
  71.     p2->Fun_1();
  72.     p2->Fun_2();
  73.     p2->Fun_3();
  74.  
  75.     cout<<endl<<"p3:"<<endl;
  76.     Base* p3=new Derive_1(new Derive_3());
  77.     p3->Fun_1();
  78.     p3->Fun_2();
  79.     p3->Fun_3();
  80.  
  81.     cout<<endl<<"p4:"<<endl;
  82.     Base* p4=new Derive_1(new Derive_3(new Derive_2()));
  83.     p4->Fun_1();
  84.     p4->Fun_2();
  85.     p4->Fun_3();
  86.     return 0;
  87. }
Success #stdin #stdout 0.02s 2860KB
comments (?)
stdin 
Standard input is empty
stdout 
p1:
Derive_1 Executed
Derive_2 Executed

p2:
Derive_2 Executed
Derive_3 Executed

p3:
Derive_1 Executed
Derive_3 Executed

p4:
Derive_1 Executed
Derive_2 Executed
Derive_3 Executed
https://ideone.com/uOHPu
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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