Create and use friend functions - C++ Class

C++ examples for Class:friend

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Description

Create and use friend functions

Demo Code

#include <iostream>
using namespace std;
class beta;              //needed for frifunc declaration
class alpha//www .ja  va  2 s . c om
{
   private:
   int data;
   public:
   alpha() : data(3) {  }            //no-arg constructor
   friend int frifunc(alpha, beta);  //friend function
};
class beta
{
   private:
   int data;
   public:
   beta() : data(7) {  }             //no-arg constructor
   friend int frifunc(alpha, beta);  //friend function
};
int frifunc(alpha a, beta b)            //function definition
{
   return( a.data + b.data );
}
int main()
{
   alpha aa;
   beta bb;
   cout << frifunc(aa, bb) << endl;     //call the function
   return 0;
}

Result


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