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  1. #include <iostream>
  2.  
  3. class A {
  4. public:
  5.   virtual void report() const {
  6.     std::cout << "A" << std::endl;
  7.   }
  8.  
  9.   virtual A *instance() const {
  10.     return new A;
  11.   }
  12. };
  13.  
  14. class B : public A {
  15. public:
  16.   virtual void report() const {
  17.     std::cout << "B" << std::endl;
  18.   }
  19.  
  20.   B *instance() const {
  21.     return new B;
  22.   }
  23. };
  24.  
  25. class C : public A {
  26. public:
  27.   virtual void report() const {
  28.     std::cout << "C" << std::endl;
  29.   }
  30.  
  31.   C *instance() const {
  32.     return new C;
  33.   }
  34. };
  35.  
  36. int main() {
  37.   A *a = new A;
  38.   A *b = new B;
  39.   A *c = new C;
  40.  
  41.   A *a1 = a->instance();
  42.   A *b1 = b->instance();
  43.   A *c1 = c->instance();
  44.  
  45.   a->report();
  46.   b->report();
  47.   c->report();
  48.  
  49.   a1->report();
  50.   b1->report();
  51.   c1->report();
  52. }
  53.  
  54.  
Success #stdin #stdout 0.02s 2856KB
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A
B
C
A
B
C
https://ideone.com/CXoC1p
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
secret

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