More template stuff

Okay I can't get this to compile:

// ===========================================================================
#include <math.h>

template<typename NUMTYPE> class NumPair
{
   public:
     NUMTYPE x, y;

     NumPair(NUMTYPE xVal = 0, NUMTYPE = yVal) : x(xVal), y(yVal)
     {
     }

     // Generic IsZero()
     bool IsZero() const
     {
       return 0 == x && 0 == y;
     }

     // Specialized IsZero() for float types
     bool IsZero<float>() const
     {
       return 0.000001f >= abs(x) && 0.000001f >= abs(y);
     }
};
// ===========================================================================

however it works if I pull the specialized version of IsZero() outside
of the class definition like this:

template<> bool NumPair<float>::IsZero() const
{
   return 0.000001f >= abs(x) && 0.000001f >= abs(y);
}

Is there some way to specify the syntax to get the first example to compile,
or am I stuck using the method outside the scope of the class definition?

Thanks