Why can't I access private functions of class Box in ostream& operator<<(ostream& out, const Box& B){cout << B.l << " " << B.b << " " << B.h << endl; }?
#include<bits/stdc++.h>
using namespace std;
class Box{
int l, b, h;
public:
Box(){
l=0;
b=0;
h=0;
}
Box(int length, int breadth, int height){
l=length;
b=breadth;
h=height;
}
bool operator < (Box &B){
if(l < B.l)return 1;
else if(b < B.b && l==B.l)return 1;
else if(h< B.h && b== B.b && l==B.l)return 1;
else return 0;
}
};
ostream& operator <<(ostream& out, const Box& B){
cout << B.l << " " << B.b << " " << B.h ;
return out;
}
The problem is that you don't have any friend declaration for the overloaded operator<< and since l, b and h are private they can't be accessed from inside the overloaded operator<<.
To solve this you can just provide a friend declaration for operator<< as shown below:
class Box{
int l, b, h;
//other code here as before
//--vvvvvv----------------------------------------->friend declaration added here
friend ostream& operator <<(ostream& out, const Box& B);
};
//definition same as before
ostream& operator <<(ostream& out, const Box& B){
cout << B.l << " " << B.b << " " << B.h ;
return out;
}