RE: Starting out with sub-procedures

PI = Procedure Interface. It is the "Entry PList" for a subprocedure.
PR = Prototype. It is the helper code the compiler uses to syntax check your
CALLP and implicit calls that use the prototype.
WRAPPER - Typically a short procedure that is used to call another function.
It purpose is to reduce the complexity of the call interface to that other
function. For example, a wrapper procedure could be written to create a user
space by giving it nothing more than the user space name; hiding the need to
insert the other parameters into the call to the original API. This is the
concept behind my RPG ToolKit (www.rpgiv.com/toolkit)

Procedure - There are actually two versions of procedures: Procedures and
Functions. I believe the only difference is that function will return a
value to the caller during an implied call, whereas a procedure does not
return a value and hence must be called with a CALLP (in RPG IV speak). A
procedure has local variables (typically) and can access its own local
variables as well as any globally declared variables.
SubProcedure - The official RPG IV term for Procedures and Functions.
Prototype - Is description of "PR" above.

Bob Cozzi
Cozzi Consulting
www.rpgiv.com


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
On Behalf Of Booth Martin
Sent: Monday, October 27, 2003 11:47 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: RE: Starting out with sub-procedures

Terms I thought I knew but now I'm not so sure:
 
What is the term for a PI?
What is the term for a PR?
What is a wrapper?
What is a Procedure?
What is a sub-procedure?
What is a prototype?
 
(I do understand that these are basic questions, and I thought I knew what
they mean. However some of the usages I am seeing for these terms seems to
be in conflict.)
 
---------------------------------------------------------
Booth Martin http://www.MartinVT.com
Booth@xxxxxxxxxxxx
---------------------------------------------------------
 
-------Original Message-------
 
From: RPG programming on the AS400 / iSeries
Date: Monday, October 27, 2003 11:15:58 AM
To: RPG programming on the AS400 / iSeries
Subject: RE: Starting out with sub-procedures
 
In this example, you don't need a PI. You are just PRototyping the call to
QCMDEXC. But, if you wish to write a wrapper to QCMDEXC, you would need a
PI.
 
Thanks,
 
Mark
 
Mark D. Walter
Senior Programmer/Analyst
CCX, Inc.
mwalter@xxxxxxxxxx
http://www.ccxinc.com
 
 

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