Why do I get the error "X is not a member of Y" even though X is a friend of Y?
- by user1232138
I am trying to write a binary tree. Why does the following code report error C2039, "'<<' : is not a member of 'btree<T'" even though the << operator has been declared as a friend function in the btree class?
#include<iostream>
using namespace std;
template<class T>
class btree
{
public:
friend ostream& operator<<(ostream &,T);
};
template<class T>
ostream& btree<T>::operator<<(ostream &o,T s)
{
o<<s.i<<'\t'<<s.n;
return o;
}
