template friend functions of template class

Question

I have the following template class and template function which intends to access the class\' private data member:

#include 

template

        

Answer 1

Well there is a solution that is both simple and involving separation between declaration & definition of the friend function. In the declaration of the friend function (inside the class) you have to give a different template param from the one the class accepts (and it make sense cause this function is not a member of this class).

template
class MyVar
{
    int x;

    template
    friend void printVar(const MyVar & var);

    template
    friend void scanVar(MyVar & var);
};

template
void printVar(const MyVar & var) {

}

template
void scanVar(MyVar & var) {

}

No forward declaration needed, as well as there is a separation of declaration & definition.