c-resources/CPlusPlus20ForProgrammers-master/examples/shapes/shapes.cpp

#include <iostream>
#include <vector>
/*class GBaseShape {
	public:
    GBaseShape();
virtual void  EvalVolume();
virtual void  EvalSurface();
double GetVolume() const;
double GetVolume() const;

	private:
    double Volume, Surface;
    bool IfVolumeCalculated;
    bool IfSurfaceCalculated;
};
*/




class Cube {
  public:
      explicit 	Cube(double _L = 0, double _W = 0, double _H = 0, long int N = 0);
    ~Cube(){
     //  std::cout << "Destructor was run!\n";
     delete Data;
    }
 //     void SetAll();
      void SetL(double _L);

//      void SetB(double _B);
//      void SetC(double _C);
      
      const double& GetL();
      double& operator[] (int i){
           if(i==1)
            return L;
           if (i==2)
             return W;
           if (i==3)
             return H;
        return tmp;
      }
  private:
      double L,W,H;
      double* Data;
      double tmp;
};


Cube::Cube(double _L , double _W , double _H, long int N  ){
   SetL(_L); 
   Data = new double[N];
   //std::cout << "Constructor was run!\n";
}

void Cube::SetL(double _L){
     L = _L;
}

const double& Cube::GetL()  {
	return L;
}

int main(){
    
	Cube cube(5,6,10);
    
	//cube.GetL()++;
   // for (int i{0}; i<10000; i++)
   // {
   //     auto c = Cube(0,0,0,1000000);
   // }
    //for (int i{0}; i<10000000000; i++)
    //     std::cout << "!!!\n";

      std::cout << cube[1] << "\n";
	return 0;
}