Re: Latest RPG Updates

I thought that is what I had said Peter - but yes ALL have to be present otherwise how would the overload one know which to pick? If they are not there it has nothing to compare with.

The only time that an overloaded prototype is not required is for procedures that are local and the parameter information can de derived from the procedure interface.

On Oct 8, 2019, at 3:52 PM, Peter Dow <petercdow@xxxxxxxxx> wrote:

Yes, but my question is, are the candidate prototypes *required*, or just the overloading prototype? If it is indeed fundamentally a compiler directive, then it would seem they are all required. And if they're all required, one might as well use the candidate prototypes.

On 10/8/2019 1:21 PM, Jon Paris wrote:

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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