| Re: Discussion on global variables in IDL [message #26036 is a reply to message #26018] |
Wed, 01 August 2001 05:50   |
Martin Schultz
Messages: 515
Registered: August 1997
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Senior Member |
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alt@iszf.irk.ru (Altyntsev Dmitriy) writes:
> Hello,
>
> I'd like to discuss global variable management in IDL. I've read a
> pair of NG threads on that theme, and would like to add some
> consideration and share experience. Some time ago I've sent a letter
> to RSI with some proposals, but since then two version have been
> released and I don't see any movement in the direction of improving
> global vars management. It seems that everyone is satisfied. Is it
> really so?
Well, I don't think the situation is as bad as you paint it. First of all
I recommend objects - which are in fact "global" (as long as you don't loose
the object reference), secondly widgets (which provide you with a UValue
field and thu sgive you an opportunity to assess the underlying widget object
reference as long as you see it on the screen ;-) [but, seriously: don't
tell David that you have seriously even thought about using a COMMON block
in a widget program; he will slam you with a box of his books]. Finally,
you have user variables (the ! thingies). So, if you like, you can make
up your own global variable system by defining a system variable !GLOBAL
which contains a pointer pointing to a pointer (or object reference) array;
plus, you will need some "management" information. Come to think of it;
the behaviour you would like to see there, is exactly what a container
object is designed for. And if you use my version (instead of IDL_Container),
you can even search your variables by name.
Cheers,
Martin
--
[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[
[[ Dr. Martin Schultz Max-Planck-Institut fuer Meteorologie [[
[[ Bundesstr. 55, 20146 Hamburg [[
[[ phone: +49 40 41173-308 [[
[[ fax: +49 40 41173-298 [[
[[ martin.schultz@dkrz.de [[
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