Question

i am new to c++ programming, can we declare some members of class as friend to other class. it means Lets say Class A have three member functions and instead of declaring whole class as friend to other Class B (say) can i declare only one member of class A as friend to Class B, so please help.

Answer 1

Yes you can declare a single member function as friend of another class.
Online Sample:

#include<iostream>
class Myclass;
class Otherclass
{
    public:
      void doSomething(Myclass &obj);

};
class Myclass
{
    int i;
    friend void Otherclass::doSomething(Myclass &obj);
};
void Otherclass::doSomething(Myclass &obj)
{
    obj.i = 10;
    std::cout<<obj.i;
}


int main()
{
    Myclass obj;
    Otherclass obj2;
    obj2.doSomething(obj);
    return 0;
}