C++ reference value working like a macro? [on hold]

I'm wondering about C++ reference value working mechanism.

For this code, I think that it should be return error at position 1 but it return the error at position 2. It seems referencing variable works like a macro. Is it right??

void function()
{

   foo* a = NULL;

   int& b = a->member();   /// position 1

   cout<<b<<endl;          /// position 2
}