Re: Procedure pointer use cases

I have several products including my Trigger Mediator and my IBMiInterface
that rely on procedure pointers. Both are based on translating a name into
a service program name and procedure. You then translate the service
program and procedure into a procedure pointer and dynamically call the
service program.

Anytime you don't know which procedure you want to run until you get to run
time you can use procedure pointers to load the service program dynamically.

If you look at www.think400.dk/downloads.htm you will find a project with
service programs that dynamically load a service program. Further down is a
Trigger Mediator that uses that technology.

I have used them all over the place. I wrote a State Transition engine that
used callbacks to execute the actions. I used callbacks to call a CL module
that set a library list and then did a callback to the RPG module. Very
powerful tools.




On Sat, Oct 14, 2017 at 4:46 PM, Jay Vaughn <jeffersonvaughn@xxxxxxxxx>
wrote:

Using rpg templates make them more understandable if you aren't used to
them.
On Oct 14, 2017 4:16 PM, Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx> wrote:

For callbacks, mainly.

HTTPAPI and FTPAPI use them extensively.

I use them any time I have some part of the logic that I want to be
flexible (the caller inserts his/her own routine to do part of the
processing, and each callers logic might be different.)

This type of coding is ubiquitous in javaScript, so if you're used to
that paradigm, it's easy to think that way when writing RPG, too.


On 10/13/17 9:25 PM, Justin Taylor wrote:

I've been doing RPG for 20 years, and I don't think I've ever said

"this looks like a job for procedure pointers". I was wondering if anyone
could share real-world examples where procedure pointers would be the best
solution?

Thanks

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