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  1. #include <iostream>
  2.  
  3. using std::cout;
  4. using std::endl;
  5.  
  6. class Base
  7. {
  8.     public:
  9.         int x;
  10.  
  11.         Base() : x(42)
  12.         {
  13.         }
  14.  
  15.         virtual void PrintSomething()
  16.         {
  17.             cout << "Base::PrintSomething x=" << x << endl;
  18.         }
  19. };
  20.  
  21. class Derived : public Base
  22. {
  23.     public:
  24.         int y;
  25.  
  26.         Derived() : y(-1)
  27.         {
  28.             x = 0;
  29.         }
  30.  
  31.         virtual void PrintSomething()
  32.         {
  33.             cout << "Derived::PrintSomething x=" << x << " y=" << y << endl;
  34.         }
  35. };
  36.  
  37. int main (int argc, char *argv[])
  38. {
  39.     Base bValue;
  40.     Derived dValue;
  41.  
  42.     bValue.PrintSomething();
  43.     dValue.PrintSomething();
  44.  
  45.     Base *bPointer1 = &bValue;
  46.     Base *bPointer2 = &dValue;
  47.  
  48.     // call PrintSomething virtually
  49.     bPointer1->PrintSomething();
  50.     bPointer2->PrintSomething();
  51.  
  52.     Base bCopy1 = bValue;
  53.     Base bCopy2 = dValue;   // dValue is sliced
  54.  
  55.     // call PrintSomething non-virtually
  56.     bCopy1.PrintSomething();
  57.     bCopy2.PrintSomething();
  58.  
  59.     return 0;
  60. }
Success #stdin #stdout 0s 2896KB
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stdin
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Standard input is empty
stdout
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Base::PrintSomething x=42
Derived::PrintSomething x=0 y=-1
Base::PrintSomething x=42
Derived::PrintSomething x=0 y=-1
Base::PrintSomething x=42
Base::PrintSomething x=0
https://ideone.com/UteSxT
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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