lists & widgets
My dear fellow incorruptible dos dinosaurs,
I have whipped up a treat for you: widgets, basic dos GUI elements.
They are not designed to compete with Bill's Great $cheme, or David's
interpretation of that monstrosity, but if you need a button or two, a
simple menu, or even a file selector, you are welcome to them.
Why? And why about three years too late?
Well, why not? - Initially I was provoked by the recent outbreak of OO
accidents. To the simple, uninitiated mind, like mine, they all looked
like either a conglomeration of spelling mistakes or a ghastly result
of some terrible java(nese) affliction. I thought there had to be a
simpler, better way. So I revamped my old associative lists code, and
when I was quite happy with it, I was searching for an nice example, a
worthwhile demo. Then I spotted my old widgets, with a three year dust
layer on them. Soon enough they just took over my life, for the
following couple of weeks anyway... - And after going so far, I
decided I
might just as well share it!
Btw, associative lists, sometimes also called dictionaries, or keyed
lists, are quite powerful, and at the same time very intuitive
devices. And as long as the current namespace nightmare continues,
they are probably the best antidote. They can, for example, easily
simulate flexible structures. Sensibly combined with ordinary
sequences, (see the widgets 
, or with hashed or sorted lists, they
can also be used in creating very interesting database schemes. They
are, of course, somewhat slower than ordinary sequences, but even in
comparison with say btrees, they looked quite respectable. They do not
suffer, not to the same degree anyway, from indexing overheads of deep
nested trees.
I have just sent a couple of bundles to Rob. In case he decides not to
have such retrograde material on his site, you can also fetch it off
my own page.
Enjoy. jiri
http: homepages.paradise.net.nz/~jbabor/euphoria.html
Robert Stanton
Plessey Asia Pacific Pty Ltd
mailto: rstanton at plessey.com.au
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