Re: Latest RPG Updates -- RPG400-L

Basically the rules haven't changed. For a procedure/program to be called, a prototype (or the PI for internals) must be present.

That includes the overloading proto. Normally I would have all (say) three protos in a /Copy source - I'm just going to add the overload one to that set. No increase in work except for the original definition of the overload proto.

This is all a compile time function and as I said earlier fundamentally a compiler directive in a different form.

On Oct 8, 2019, at 1:11 PM, Peter Dow <petercdow@xxxxxxxxx> wrote:

Jon,

Assuming the FORMAT procedure and its candidate procedures are all in a service program, how do I use it in another RPG program? I would guess that I have to put the prototype in the RPG program, yes? Do I have to put all the candidate prototypes in there too? My thought was the RPG program using it would simply have

Dcl-Pr Format Override( ProcA, PgmB, JavaC );

but now that I put it that way, the compiler would have to go to the service program to check my usage against each of those candidate prototypes to see if it's allowed.

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On 10/8/2019 12:14 PM, Jon Paris wrote:

FORMAT is never exported because it is only really a compiler directive.

For example thing of it this way.

Dcl-Pr Format Override( ProcA, PgmB, JavaC );

This is handled by the compiler much like a conditional compilation directive such as ...

/IF ParmMatches ProcA
CallP ProcA(parm);
/ELSEIF ParmMatches ProcB
CallP PgmB(parm);
/ELSE
....

It is that simple.

On Oct 8, 2019, at 11:28 AM, Justin Taylor <JUSTIN@xxxxxxxxxxxxx> wrote:

Is FORMAT exported? There will be times when I want it exported and other times I don't. My best guess is that it inherits from the actual procedures.

-----Original Message-----
From: Jon Paris [mailto:jon.paris@xxxxxxxxxxxxxx]
Sent: Tuesday, October 08, 2019 1:04 PM
To: RPG programming on IBM i <rpg400-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: Latest RPG Updates

Actually it doesn't matter if the procedure is exported or not. In fact the overloaded routines can include programs, Java calls, and subprocs.

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