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@REPLYADDR Anton Ertl
<anton@mips.complang.tuwien.ac.at>
@REPLYTO 2:5075/128 Anton Ertl
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albert@cherry.(none) (albert) writes:
>I finally understood what closures mean.
>In Forth parlance it is a search order that is kept with an
>Forth word.
That view leads down to boy compilers (in Knuth`s man-or-boy test),
and at best (if you save and restore the variables on function entry
and exit) dynamically-scoped Lisp.
>An environment is a wordlist,
A wordlist has only one instance of each word in a wordlist.
An environment in a statically-scoped language is a set of local
frames, where each local frame is created dynamically when the
function to which the frame belongs is called. So if a function has
two instances at the same time (e.g., in recursion), a wordlist is
insufficient.
You can use wordlists to store the offsets of variable within the
frames, but you have to manage the frames separately.
- anton
--
M. Anton Ertl
http://www.complang.tuwien.ac.at/anton/home.html
comp.lang.forth FAQs:
http://www.complang.tuwien.ac.at/forth/faq/toc.html
New standard:
https://forth-standard.org/
EuroForth 2023:
https://euro.theforth.net/2023
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