Re: questions about callback#

Bernd Paysan <[email protected]> Wed, 01 Aug 2018 01:24:52 +0200

Newsgroups	gmane.comp.lang.forth.gforth
Message-ID	<1634991.NQVXvcRJUL@daiyu>

Am Mittwoch, 1. August 2018, 00:11:34 CEST schrieb Reepca Russelstein:
> callback# is used both at generate-time (in words used by
> callback-gen) and at first-instantiation-time. If the two values don't
> match, bad things happen (in my case, I attempted to pass a function
> pointer pointing to address 14. Yikes).
> 
> Example:
> 
> c-library test
> 3 to callback#
> c-callback used-rarely -- void
> 20 to callback#
> c-callback used-frequently n -- void
> end-c-library
> 
> ' noop used-rarely .
> 
> Prints 8 for me - it tries to access the 19th callback of
> used-rarely... seems that ccb-num should be set at generate-time
> rather than setup-time.

Yes, makes sense, when you use callback# like this (and you should be able to 
do so).

-- 
Bernd Paysan
"If you want it done right, you have to do it yourself"
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