Re: Overloading RPG Subprocedures

Brad,

You've always been able to return a different DS depending on what is
passed in. If you turn off options(*exact) the data structure is simply
passed as a string/buffer.

So if you were to code the parameter as CHAR(10000) (or any suitably big
number) and options(*varsize) you can pass any data structure you like.
You'll need a way to work out what sort of DS you have (possibly by
having a "format" field in the DS itself, or by passing a different
parameter that indicates which DS it is. If you do this, you may also
want to pass a parameter to indicate the size of the DS so you can be
sure not to overrun memory.

(That is what all the IBM APIs do and why we have formats like FMT0100,
FMT0200, etc)

Overloading won't make things easier for the subprocedure itself. It
makes things easier for it's caller.

-SK

On 1/15/2024 7:02 AM, Brad Stone wrote:

That's what I was thinking too, Scott (as mentioned in my last email).

I just have a couple very similar subprocedures where the only real
difference is the path of the call to a web API and one output

parameter...

What I really would like in actuality is the ability to return a

different

DS depending on what is passed in.

Just playing around during these cold slow days. :)

On Sun, Jan 14, 2024 at 10:56 PM Scott Klement <

rpg400-l@xxxxxxxxxxxxxxxx>

wrote:

Brad,

This seems like an unusual use case, why would you want a routine where
the caller doesn't need to distinguish between a PO and an invoice?

That said, the code you provided should work. Are you having problems?

-SK

On 1/14/2024 4:11 PM, Brad Stone wrote:

So, I decided to start digging into this. It looks pretty cool. Thanks

for

the examples online (Scott!)

I have yet to find any examples with more than one parameter, so here

is

my

question....

Can you overload with multiple parameters where one or two are

different?

Like this to retrieve an invoice or PO:

dcl-pr getInvoice int(10);
In_ID char(128) const;
Out_Invoice likeds(invoiceDS) options(*exact);
end-pr;

dcl-pr getPO int(10);
In_ID char(128) const;
Out_PO likeds(poDS) options(*exact);
end-pr;

dcl-pr getData int(10) Overload(getInvoice:getPO);

So you could do something like:

dcl-ds thisInvoiceDS like(invoiceDS) end-ds;
dcl-ds thisPODS like(poDS) end-ds;
dcl-s rc int(10);

rc = getData('10':thisInvoiceDS);
rc = getData('10':thisPurchaseOrderDS);

From what I'm reading this should work.

Blizzards are fun. Downtime = exploring time. :)


Bradley V. Stone
www.bvstools.com
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