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  1. #include <iostream>
  2.  
  3. class A
  4. {
  5. public:
  6.     virtual void func() = 0;
  7. };
  8.  
  9. class B
  10. {
  11. private:
  12.     void func1() { std::cout << "func1\n"; };
  13.     void func2() { std::cout << "func2\n"; };
  14.  
  15. public:
  16.     class C1 : public A
  17.     {
  18.     private:
  19.         B &m_b;
  20.     public:
  21.         C1(B &b) : m_b(b) {}
  22.         void func() override { m_b.func1(); }
  23.     };
  24.  
  25.     class C2 : public A
  26.     {
  27.     private:
  28.         B &m_b;
  29.     public:
  30.         C2(B &b) : m_b(b) {}
  31.         void func() override { m_b.func2(); }
  32.     };
  33. };
  34.  
  35. void doSomeStuff(A &a) 
  36. {
  37.     a.func();
  38. }
  39.  
  40. int main()
  41. {
  42.     B b;
  43.  
  44.     {
  45.     B::C1 c(b);
  46.     doSomeStuff(c);
  47.     }
  48.  
  49.     {
  50.     B::C2 c(b);
  51.     doSomeStuff(c);
  52.     }
  53.  
  54.     return 0;
  55. }
Success #stdin #stdout 0s 4548KB
comments (?)
stdin 
Standard input is empty
stdout 
func1
func2
https://ideone.com/Y2qc7c
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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