• Andy Friesen (37/37) Jun 23 2004 The following code recurses (printing 'int' over and over) until the

Andy Friesen <andy ikagames.com> writes:

The following code recurses (printing 'int' over and over) until the 
stack overflows:

     struct Empty;

     template TypeList(T, R) {
         struct TypeList {
             alias T Type;
             alias R Rest;
         }
     }

     template Blah(A, alias B, alias C) {
         void Blah() {
             typeid(C.Type).print();
             .Blah!(A, B, C.Rest)();
         }
     }

     template Blah(A, alias B, C : Empty) {
         void Blah() {
             printf("Empty!\n");
         }
     }

     alias TypeList!(int, TypeList!(float, TypeList!(char, Empty))) TL;

     int main() {
         Blah!(Empty, main, TL)();
         return 0;
     }

Changing the definition of TypeList to:

     template TypeList(T, R) {
         alias T Type;
         alias R Rest;
     }

Causes an illegal operation and the error messages:

	template instance TypeList!(float,TypeList_aS6ttest25Empty) does not 
match any template declaration
	template instance TypeList!(float,TypeList_aS6ttest25Empty) cannot 
resolve forward reference

(that's it for now.  Honest)

  -- andy