Re: Prototyping procedure pointers

["Simon Coulter" <shc@xxxxxxxxxxxxxxxxx>]

Œ
Hello Jon,

Paul Tuohy suggested that to me privately also.  I haven't tried it yet.  It'll 
have 
to wait a day or so.  Perhaps I'm having a low biorythm day but I can't see why 
the 
apostrophes matter.  

I was expecting to have to invoke the procedure pointer, but with this 
definition I 
still invoke the procedure using the prototype name.  I can see the logic.  If 
I 
define a prototype like:

        D HDLR_ENTRY      PR                ExtProc(HDLR_ENTRY_)

and a procedure pointer like:

        D HDLR_ENTRY_     S             *   PROCPTR

and invoke it as:

        C               EVAL    HDLR_ENTRY_ = %PADDR(some-function)
        C               CALLP   HDLR_ENTRY

the compiler uses the prototype which says really use the pointer thus 
satisfying the 
prototype requirements as well as the dynamic procedure invocation.  

Regards,
Simon Coulter.

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//--- forwarded letter -------------------------------------------------------
> Date: Sun, 25 Jun 2000 19:49:22 -0400
> From: Jon.Paris@hal.it
> To: RPG400-L@midrange.com
> Reply-To: RPG400-L@midrange.com
> Subject: Prototyping procedure pointers

> 
> 
> 
>  >> D HDLR_ENTRY      PR
> 
> If I understand you correctly Simon you just need to add ExtProc... to your
> proto e.g.
> 
> D HDLR_ENTRY      PR                ExtProc(HDLR_ENTRY_)
> 
> Notice no quotes in the Extproc entry.  I'd use pHDLR_ENTRY_ to differentiate
> the pointer from the proto.
> 
> The only drawback to using this method is that you can't use the same proto in
> the actual hadler proc itself and therefore can't get it validated  against 
>the
> PI but ......
> 

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