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

This one compiles on MSVC2013. Basicly adds the forward declarations to class and functions before the friend

template   class MyVar ; // class forward declaration

template ; // function forward declarations
void printVar(const MyVar& var);
template
void scanVar(MyVar& var);

template
class MyVar
{
    friend void printVar(const MyVar&);
    friend void scanVar(MyVar&);
    int x;
};

template
void printVar(const MyVar& var)
{
    std::cout << var.x << std::endl;
}

template
void scanVar(MyVar& var)
{
    std::cin >> var.x;
}

struct Foo {};

int main1(void)
{
    MyVar a;
    scanVar(a);
    printVar(a);
    return 0;
}