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 :-/