multiple opApply functions?

[Jason House]

Is it possible to have multiple opApply calls for a single class?  The 
following code almost compiles. It appears gdc 0.23 (implementing dmd 
1.007) tries to match against the first opApply instead of finding the 
correct match (the 2nd opApply).

The compiler knows the first one is a bad match, gives an error, and 
exits.  How do I overcome this?

interface X(T,P){
   int opApply(int delegate(P));
   int opApply(int delegate(T));
   int opApply(int delegate(P,T));
}

class Y(T,P) : public X(T,P){
   ...
}

int main(){
   Y y = new Y!(int,float)(...);
   foreach(int x; y){
     ...
   }
}