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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: thick Tcl binding, am I being logical ?
Date: Sun, 19 Jan 2014 17:56:53 +0000
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Date: 2014-01-19T17:56:53+00:00
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Simon Wright <simon@pushface.org> writes:

> Simon Wright <simon@pushface.org> writes:
>
>> The only problem I've come across with this style is how to manage
>> changes in the model that need to be reflected in the view; polling
>> certainly works but seems less than ideal. Maybe Tcl_Eval and variable
>> tracing would do the trick.
>
> Variable tracing works fine, with Tcl_SetVar(). I've added a demo to
> Tash at r162, see also at Dropbox[1].
>
> Note, this demo is syntactically correct, but I'm concerned that it's
> synchronous, whereas the only sensible use case is asynchronous (the Ada
> model generates a new value in response to an input of which Tcl is
> unaware). More thought needed.

Yes, it was much more complicated than I'd thought.

> [1] https://www.dropbox.com/s/nn8qkcbp3z30zcj/watching.tar.gz

I've deleted this, in favour of tash-8.6-1-20140118.zip at Sourceforge.