accessing numeric template parameters

[Dominikus Dittes Scherkl via Digitalmars-d-learn]

If I have a struct with numeric template parameter, how can I 
access it within member functions? Like normal member variables? 
And how about the constructor?

struct polynomial(uint base)
{
private:
   uint[] N;
public:
   this(uint x) { base = x; }
   ...
   void add(Polynomial!base P)
   {
      if(N.length < P.N.length) N.length = P.N.length;
      foreach(i; 0..P.N.length)
      {
         N[i] = (N[i]+P.N[i]) % base;
      }
   }
}
This doesn't work for me :-/