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  1. #include <iostream> 
  2.  
  3. using namespace std;
  4.  
  5. class Base
  6. {
  7. public:
  8.     virtual void fun()
  9.     {
  10.         cout << "Base";
  11.     }
  12. };
  13.  
  14. class Der : public Base
  15. {
  16.     Base* pb;
  17.     Der(Base* b) : pb(b) {}
  18. public:
  19.     static Der Decorate(Base* b){ return Der(b); }
  20.     virtual void fun()
  21.     {
  22.         cout << "Der...";
  23.         pb->fun();
  24.     }
  25. };
  26.  
  27. int main()
  28. {
  29.     Der::Decorate(&Der::Decorate(&Base())).fun();
  30.     return 0;
  31. }
Success #stdin #stdout 0s 2928KB
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stdin
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Standard input is empty
stdout
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Der...Der...Base
https://ideone.com/vRuU4Q
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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