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Using a Friend
Using a friend function is quite easy. The following example explains a friend function to access members of two classes.
class Bclass; // Forward Declaration
class Aclass
{
public :
Aclass(int v)
Avar = v;
}
friend int addup(Aclass &ac, Bclass &bc);
private :
int Avar;
};
class Bclass
Bclass(int v)
Bvar = v;
int Bvar;
int addup(Aclass &ac, Bclass &bc)
return( ac.Avar + bc.Bvar);
void main()
Aclass aobj;
Bclass bobj;
int total;
total = addup(aobj,bobj);
Pointers are just numbers, representing addresses in memory. You can add to and subtract from pointers, for instance. It is pretty easy to make mistakes with pointer math, however,
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A: They present a degree of freedom in the interface design options. Member functions & friend functions are equally privileged (100% vested). The major difference is that a fri
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