RE: passing along *NoPass arguments

["Bob Cozzi" <cozzi@xxxxxxxxx>]

Nope!

It doesn't work like C. :(
A null-value or null ptr isn't the same as no parameter to the RPG
language. :(
You'd actually have to call Proc2 with no parms if no parms were passed,
something like this:

  if %parms >=1;
     Proc2( InArg1 );
  else;
     Proc2();
  endif;

Otherwise Proc2() will always think it has a parm passed, that is %Parms
always returns 1.
As to OPTIONS(*OMIT)... What a nightmare!!!

callP   Proc1(*OMIT);
... Then later, in Proc1...


  If %Parms >=1;
    if %addr(InArg1) = *NULL;
      Proc2();
      return;
    endif;
  endif;
  Proc2(InArg1);

Oh, and don't forget all those semi-colons in free-format;;;;;;;;;;;

-Cozzi


-----Original Message-----
From: rpg400-l-bounces@midrange.com
[mailto:rpg400-l-bounces@midrange.com] On Behalf Of Steve Richter
Sent: Wednesday, January 08, 2003 11:03 AM
To: Chat. Rpg400-L
Subject: passing along *NoPass arguments



Proc1 receives an arg that is *NoPass:

pProc1            b
dProc1            pi
d InArg1          n         options(*NoPass)
 /free
      Proc2( InArg1 ) ;
 /end-free
p                 e

and passes it along to Proc2 which also defines the arg as *NoPass:
pProc2            b
dProc2            pi
d InArg1          n         options(*NoPass)
 /free
      if    %parms >= 1 ;
        dsply   'Arg1 is passed' ;
      endif ;
 /end-free
p                 e

In practice, Proc2 always thinks it was passed an argument.  Even when
Proc1 is called without an arg value.

Shouldnt passing a not passed *NoPass argument either signal an
exception or pass along the *NoPass indicator?

I was hoping that options(*NoPass:*Omit) was the answer.  That a missing
arg value would be passed as *Omit and passed downstream as *Omit also.
But it does not work that way.  Unless Proc1 is called as "Proc1( *Omit
) ;", Proc2 will think it was passed something.


Steve Richter


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