strategy pattern in c++, strategy pattern Program in Cpp

strategy pattern in c++, strategy pattern Program in Cpp

#include   
 #include   
  
 using namespace std;  
   
 class CStrategyPattern {  
     public:  
        virtual ~CStrategyPattern() {  
        }  
        virtual string m_format(const string &, const string &) const=0;  
 };  
  
 class Formatter : public CStrategyPattern {  
     public:  
        string m_format(const string & s1, const string & s2) const  
        {  
            return s1 + "" + s2 + "";  
        }  
 };  
  
 void display_message(const CStrategyPattern & strategy){  
 cout << strategy.m_format("c", "cplusplus.com") << endl;  
 }  
  
 int main() {  
 display_message(Formatter());  
 return 0;  
 }