[gclist] Reference counting on the fingers of one thumb.
Henry G. Baker
Wed, 15 Jan 1997 08:45:45 -0800 (PST)
> One of the tricky things in a language like this is that if you take
> the specification literally, there is an awful lot of copying. You can
> use the SETL trick at run time to eliminate some of it, but an even
> better trick is to do as much as you can at compile time.
'Hash-consing' is a _general_ solution to your copying problem, and is
within O(1) of the best possible. See