new class howto?

[newbie]

hi,

why is it that one can not create a class with the following:

module A
extern (Windows):
uint  P_Start(char * pParam);
void  P_Stop();

module A
import A;

class XXX {
public:
  this() {}
  uint start(char *yy) {
    return  P_Start(yy);
  }
  void start(char *yy) {
    P_Stop();
  }
}


module C

 XXX tester = new XXX();


it will always generate an error during compilation:

      non-constant expression

when i try to do that in a function, then i will get an exception.