• Subject: Variable prototyped parameters.
  • From: David Morris <dmorris@xxxxxxxxxxxxx>
  • Date: Thu, 04 Sep 1997 10:24:34 -0600

Does anyone know a way to pass a prototyped, optional, variable
length parameter where the type is not known?  Ideally I would
like to do something  like
options(*VARSIZE:*VARTYPE:*NOPASS) with OPDESC.  The
called procedure knows the expected format.  If possible I would
like to validate the passed parms match the expected format.   If I
pass the address of the parameter can I verify the format of what
was passed?  I thought about using CALLB to build my own
OPDESC area using %size, %addr, and %decpos, but it seems
convoluted.

The manual alludes to a future solution with the statement: 
"Currently, the ILE RPG/400 compiler only supports operational
descriptors for character and graphic fields and subfields.
Operational descriptors are not available for data structures,
arrays, or tables.  In addition, operational descriptors are not
available for data of type numeric, date, time, timestamp, basing
pointer or procedure pointer."  Would this be possible in V4R1?

Thank you for any ideas you might have.

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