Re[2]: OO in RPG

["Eric N. Wilson" <doulos1@xxxxxxxx>]

Hello Peter,

Monday, December 04, 2000, 5:51:24 PM, you wrote:

> Jon has already alluded to the fact that the standard use procedure pointers
> only gives the illusion of dynamic procedure calls. In other words the
> procedure call is dynamic only in the sense that it points to a procedure
> whose address was resolved at compile time or when the program was activated
> in the case of a service pgm, unlike the old dynamic calls that are resolved
> only at runtime. It means that you can benefit by coding a call using a
> procedure pointer but you still have to include code that initializes all
> the pointers by assigning them the address of the corresponding procedure.
> So you are in effect still hard coding all the procedure calls.

> To obtain a truly dynamic procedure call that is not known at compile time
> you must you the special API's that permit you to force the activation of a
> service pgm and provide access to the procedures within.

One could also register the Procedure pointer by calling the routine
with the pointer to the function... Like one does for QSORT for the
comparison function.... And there are wonders that can be done with
double indirection :-) (As my father used to tell me... There is
nothing that can't be solved by another level of indirection :-)


----------------------------------
Eric N. Wilson
President
Doulos Software and Computer Services


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