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Error when using !NULL as a property value. Bug or feature? [message #76441]

Thu, 02 June 2011 08:56

Jason Ferrara
Messages: 17
Registered: February 2008

Junior Member

Given the object definition...

pro proptest::GetProperty, something=s, empty=e
s = [1,2,3]
e = []
end

PRO proptest__define
struct={proptest, INHERITS IDL_Object}
END

I can do...

IDL> p=obj_new('proptest')
% Compiled module: PROPTEST__DEFINE.
IDL> p.getproperty, something=v
IDL> print, v
1 2 3
IDL> p.getproperty, empty=v
IDL> print, v
!NULL

So far so good. Using the new IDL 8 property access syntax I can do..

IDL> v=p.something
IDL> print, v
1 2 3

but then..

IDL> v=p.empty
% Variable is undefined: <UNDEFINED>.
% Execution halted at: $MAIN$

Why is !NULL not valid in this case?

Jason Ferrara
Jacquette Consulting, Inc.
710 Providence Road
Malvern, PA 19355
jason.ferrara@jacquette.com

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