| Re: Commons, Was: can i place a job advert [message #28200 is a reply to message #28199] |
Mon, 26 November 2001 17:17   |
Richard Younger
Messages: 43
Registered: November 2000
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Member |
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"Pavel A. Romashkin" wrote:
>
> This topic is irresistable.
> How about we issue a Challenge:
>
> Please modify the object definition below or create a method for objects
> to be aware of each other after creation:
Let the testing begin!
Well, I can do it with a system variable (see below) but this has all of
the disadvantages of the common block, including namespace issues.
And the namespacing discussion has already been done. I could also do
it with a few lines inserted at the beginning of the startup file,
rushing to gain the ObjHeapVar1 space first. I could also conceive of
making a DLM to declare and reference a global C variable.
But you've specifically said that there can be no direct context
communication between objects. The problem is framed so that one needs
some information on a global level. Really, if you're going to
subscribe to objects fully, you shouldn't need to find other objects
without referencing them.
The question is what are you doing that truly requires global
information? Besides, um, main level interactivity? And besides, er,
main level widget interaction? And, er, um, *mumble*
hardware-dependendent stuff, like *mumble* display controls. Okay, so
maybe there occasionally are good reasons to need some global
information. :-)
Sorry for sounding grumpy, and I agree that commons have their place,
I'd just thought I'd chime in with something a little more reasonable
than "Commons are bad."
Best,
Rich
--
Richard Younger
FUNCTION Test::init
CATCH, error
IF error NE 0 THEN BEGIN
catch, /cancel
table = OBJ_New('IDL_container')
DEFSYSV, '!RYtable', table
ENDIF
table = !RYtable
table->add, self
RETURN, 1
END
PRO Test::cleanup
table = !RYtable
table->remove, self
IF table->count() EQ 0 THEN BEGIN
Obj_destroy, table
!RYtable = OBJ_NEW()
ENDIF
self->IDLgrModel::cleanup
END
FUNCTION Test::get_others
table = !RYtable
RETURN, table->Get(/all)
END
PRO Test__define
self = {TEST, $
data_holder : ptr_new() , $
inherits IDLgrModel $
}
END
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