🚀 go-pugleaf

In article <12950@cbnewsc.ATT.COM> res@cbnewsc.ATT.COM (Rich Strebendt) writes:

>  Also, it should also be kept in mind that,
>while it is fun to figure out how to optimize very exotic constructs,
>the most frequently occuring construct in any programming language is
>equivalent to the construct x += 1

Er, not quite *any* programming language.  I have been programming
professionally in Prolog for the last five years, and I need to do
this sort of thing maybe once or twice a year.

BTW, here's how to do it:

	increment(Variable) :-
		retract(value(Variable, OldValue)),
		NewValue is OldValue + 1,
		assert(value(Variable, NewValue)).

	..., increment(x), ...

but as this makes two modifications to the database and is therefore
pretty expensive (not to mention poor style), you don't want to do it
too often.

Moral:  "Toto, I don't think we're in Kansas anymore."

-- Dave Matuszek (dave@prc.unisys.com)
-- Unisys Corp. / Paoli Research Center / PO Box 517 / Paoli PA  19301
-- Any resemblance between my opinions and those of my employer is improbable.
  << Those who fail to learn from Unix are doomed to repeat it. >>