adapter design pattern example in C++

adapter design pattern example in C++, adapter design in C plus plus, CSquareShapeAdapter Class in C++, using CSquareShapeAdapter in C++

#include   
  
 class CRoundShape  
 {  
    public:  
        virtual ~CRoundShape() { }  
        virtual void m_doRound() const=0;  
 };  
  
 class CSquareShape  
 {  
    public:  
        virtual ~CSquareShape() { }  
        virtual void m_doSquare() const=0;  
 };  
  
 class CRound_Hole  
 {  
     public:  
        void m_insert(const CRoundShape & shape) const  
        {  
            shape.m_doRound();  
        }  
 };  
  
 class CSquareShapeAdapter : public CRoundShape  
 {  
     private:  
        CSquareShape & square_shape;  
     public:  
        CSquareShapeAdapter(CSquareShape & shape) : square_shape(shape){ }  
        void m_doRound() const  
        {  
            square_shape.m_doSquare();  
        }  
 };  
  
 class CDisplayMessage : public CSquareShape  
 {  
     public:  
        void m_doSquare() const  
        {  
            std::cout << "ccplusplus.com" << std::endl;  
        }  
 };  
  
 void display_message(const CRoundShape & shape)  
 {  
 CRound_Hole().m_insert(shape);  
 }  
  
 int main()  
 {  
 CDisplayMessage shape;  
 display_message(CSquareShapeAdapter(shape));  
 return 0;  
 }