gcc 4.* template question

[Tao Ma]

Hi, everybody:

What's the way to overload template types under gcc4.1.0? Our following 
code snippet works fine under gcc3.2 but get errors under gcc4.1.0.

MScalar.h
template<class TIntegral, class TSize>
class MScalar {
  TIntegral  value_d;
 public:
  // method: mod
  TIntegral mod(TIntegral arg2) {
    return mod(value_d, arg2);
  }
  // method: mod
  TIntegral mod(TIntegral arg1, TIntegral arg2) {
    return (value_d = arg1 % arg2);
  }
 private:
  // method: mod
  template<> double MScalar<double, float64>::mod(double arg1, double 
arg2) {
    return arg1;
  }
}

Basically, we need to check the input type of mod(arg1, arg2). If arg1 
and arg2 are both double, we just return arg1;
Under gcc4.1.0, it is fine to compile it to object code, but it will get 
following error message when another class Boolean links it into 
executable file.
-------error message-----
In function `MScalar<double, double>::mod(double, 
double)':diag_param_00.cc:(.text+0x30): multiple definition of 
`MScalar<double, double>::mod(double, double)'
Boolean_diag.o:diagnose_class.cc:(.text+0x30): first defined here


Please give some advise, guys. This template problem is killing me :(

-- 
Kind Regards,
Tao Ma