Friends in a template class

Hi,

I was just curious to see how I would implement a friend function in template class. It was purely as an excercise, as I have never really found a use for it in real life. Anyway, I came up with the following code. This works fine in MSVC 2003. However it doesn't compile in g++.

You get the error:

Quote:

---

main.cpp:13: declaration of `class T'
main.cpp:5: shadows template parm `class T'

---

Does anyone know which one is correct?

Code:

---

#include <iostream>

using namespace std;

template <typename T>
class CFoo
{
private:
        T val;

public:
        CFoo(T d) : val(d) { }
        template<typename T>
        friend ostream & operator<<(ostream & os, const CFoo<T> & cf);
};

template <typename T>
ostream & operator<<(ostream & os, const CFoo<T> & cf)
{
        os << cf.val << endl;

        return os;
}


int main()
{
        CFoo<int> foo(10);

        cout << foo << endl;
        cin.get();
}

---

This compiles for me:

Code:

---

#include <iostream>

using namespace std;

template <typename T>
class CFoo
{
private:
        T val;

public:
        CFoo(T d) : val(d) { }
        //template<typename T>
        friend ostream & operator<< <T>(ostream & os, const CFoo<T> & cf);
};

template <typename T>
ostream & operator<<(ostream & os, const CFoo<T> & cf)
{
        os << cf.val << endl;

        return os;
}


int main()
{
        CFoo<int> foo(10);

        cout << foo << endl;
        cin.get();
}

---

Edit: Here's a bunch of info on the subject (in chapter 16): http://oopweb.com/CPP/Documents/CPPA...cplusplus.html

Particularly 16.2.5

Heh - how do you like that.

Cheers :)