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friend template function of template class

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  friend template function of template class Евгений Щербина <ebeholder@gmail.com> - 2012-03-18 22:04 -0700
    Re: friend template function of template class ebeholder@gmail.com - 2012-03-19 05:11 -0700

#14979 — friend template function of template class

Hi folks!

I have the following simplified code:
template <class T>
class A
{
public:
    template <class U>
    static U foo(T* p)
    {
        p;
        return U();
    }
};

class B
{
    /*template <class T>
    template <class U>
    friend U A<T>::foo<U>(T*);*/
    friend B A<B>::foo<B>(B*);
    B()
    {}
public:
};
...
A<B>::foo<B>(nullptr);

And it works quite well. But the things that I've not managed to do
are commented:
/*template <class T>
template <class U>
friend U A<T>::foo<U>(T*);*/

I don't know what the syntax I should use to make it works. So I need
to generalize my friend declaration to all possible types. I've tried
quite a few variants of syntax but had no success. Could some one
point me out what should I write instead of my commented code to make
it works? Thanks!

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#14982

Answer is there: http://stackoverflow.com/questions/9758757/friend-template-function-of-template-class

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