Simple interface demo

main.cpp

#include <iostream>
#include <vector>

class IShape{
public:
  virtual void print() = 0;
private:
};

class Rect : public IShape{
  public:
  void print(){
    std::cout << "Rect" << std::endl;
  }
};

class Circle : public IShape{
public:
  void print(){
    std::cout << "Circle" << std::endl;
  }
};

int main(int argc, char **argv) {
  std::vector<IShape*> shapes;  
  shapes.push_back(new Circle());
  shapes.push_back(new Rect());
  
  shapes[0]->print();
  shapes[1]->print();

  return 0;
}