class X {
private: //the representation (implementation) is private
int m;
public: //the user interface is public
X(int i =0) :m{i} { } // a constructor (initialize the data member m)
int mf(int i) // a member function
{
int old = m;
m = i; // set a new value
return old; // return the old value
}
};
X var {7}; // a variable of type X, initialized to 7
int user(X var, X∗ ptr)
{
int x = var.mf(7); // access using . (dot)
int y = ptr−>mf(9); // access using -> (arrow)
int z = var.m; // error : cannot access private member
}
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