func1.c

gcc-you can use this code to learn something about gcc, and inquire further into linux,

template <typename T1,typename T2>
inline void f(const T1&,const T2&) { }

template <typename T1,typename T2,void F(const T1&,const T2&)>
struct A {
    template <typename T> void g(T& i) { }
};

int main() {
    int i;
    A<int,int,f> a;
    a.g(i);
}