Non type template parameters of reference

Question

What is the use of 'non type template' parameters which are of 'reference' type? Why are such parameters also treated as 'rvalues'?

template<int &n> void f(){
   &n;               // error
}

int main(){
   int x = 0;
   f<x>();
}

Answer 1

f<x> is invalid. My compiler compiles your templated function without the bad call just fine, by the way.

template<int &n> void f(){
   int* ptr = &n;
}

int something = 0;

int main() {
    f<something>(); // success
    int x;
    f<x>(); // C2971: Cannot pass local var to template function
}