From: Eliezer S. Yudkowsky (sentience@pobox.com)
Date: Sat Mar 04 2000 - 23:54:37 MST
From: "Eliezer S. Yudkowsky" <sentience@pobox.com>
"Eliezer S. Yudkowsky" wrote:
>
> It's possible to write shallow LISP programs in C, but not deep ones.
> Same goes for writing Flare programs in LISP.
Let me amplify on that: It's possible to, for example, write shallow
Flare programs in, say, LISP, by using property lists as basic Flare
symbols. For example, one could represent:
<foo>4
<green>5</green>
<red>snap</red>
</foo>
as
("foo"
(".value" 4)
(".metadata" reference-to-whatever)
("green" (".value" 5) (".metadata" reference-to-whatever) )
("red" (".value" "snap") (".metadata" reference-to-whatever) )
)
And then go on to write tortuous code that, in essence, carries out the
motions of a Flare interpreter by hand. It would be analogous to
writing C++ programs in C by writing, say:
(*reinterpret_cast<FOO_FUNC_PTR>(item->vtab[FOO_FUNC_INDEX]))(arg1, arg2)
instead of
item->foo(arg1, arg2)
with all inheritance and such done by whatever hacked-up functions your
mind cares to imagine.
You can always write the low-level elements of a high-level language as
high-level structures in a lower-level language. A high-level structure
in a high-level language generally cannot be developed in any simpler form.
--
sentience@pobox.com Eliezer S. Yudkowsky
http://pobox.com/~sentience/beyond.html
Member, Extropy Institute
Senior Associate, Foresight Institute
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