Compiler Error C2971

'class' : template parameter 'param' : 'arg' : a local variable cannot be used as a non-type argument

You cannot use the name or address of a local variable as a template argument.

The following sample generates C2971:

// C2971.cpp
template <int *pi>
class Y {};

int global_var = 0;

int main() {
   int local_var = 0;
   Y<&local_var> aY;   // C2971
   // try the following line instead
   // Y<&global_var> aY;