barring that - a way to detect an unassigned class variable so that it
can be assigned to a value before use

would prefer not to have to set up all variables before use - class
variables set to default value

I believe that earlier versions of OpenQM did it this way (same as C+
+).

Trying to set the class variable var = x within the class gives me the
error:

GET, SET and PUBLIC routines must appear before any other executable
code

do I need to use the 'UNDEFINED' name operator (implemented as either
subroutine or function)
to deal with these property persistent values

have tried PUBLIC FUNCTION UNDEFINED()
RETURN ""
END

variables still regarded as unassigned

I am using

OPTION UNASS.WARNING ON

for now but it isn't ideal

I have found UNASSIGNED(var)

but it doesn't work with instance variables:

UNASSIGNED(CLASSNAME->INSTANCEVARNAME)

right - discovered that it's not a problem with use of UNASSIGNED(var)
- only place detection of unassigned variable will be needed will be
within the class function

UNASSIGNED(CLASSNAME->CLASSINSTANCEVARIABLENAME) doesn't work but
that's not a problem

You seem to have answered your own question!

If by "class variable" you are refering to variables declared as
PRIVATE or PUBLIC in a class module, these start out unassigned just
like locla variables in conventional programs and suborutines.

If you want to set them to some other value, you do this in the
CREATE.OBJECT subroutine (the equivalent of a constructor routine in
other OO programming languages). This optional subroutine is executed
once as the object is instantiated.

If this does not help, please post a more specific description of what
you are trying to achieve.


Martin Phillips, Ladybridge Systems

On Jan 4, 11:49*am, Martin Phillips <MartinPhill... (AT) ladybridge (DOT) com>
wrote:
ok thanks