Template in interface ?

[TSalm]

Hello,

I need to do something like this :
/* ---- CODE ---- */
import tango.io.Stdout;


interface I
{
  bool cmpType(U)(U val);
}

class  A(T):I
{
  bool cmpType(U)(U val)
  {
    static if ( is (U==T) )
      return true;
    else
      return false;
  }
}

void main()
{
  I a = new A!(int);

  int tInt = 10;
  double tDouble = 20;
  float tFloat = 30;
  a.cmpType(tInt);
  a.cmpType(tDouble);
  a.cmpType(tFloat);
}
/* ---END CODE ---- */

But it's not allow by the compiler when there's no problem when change the  
line:
  I a = new A!(int);
By
  A a = new A!(int);

:-(

Does something have an idea on how to do something like this ?

Thanks in advance,
Tsalm