Why do I get the error "X is not a member of Y" even though X is a friend of Y?

Posted by user1232138 on Stack Overflow See other posts from Stack Overflow or by user1232138
Published on 2012-03-26T15:44:49Z Indexed on 2012/03/29 17:30 UTC
Read the original article Hit count: 179

Filed under:
|

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;
}

© Stack Overflow or respective owner

Related posts about c++

Related posts about templates