[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: COPYALL, COPYLIST, et alia
- To: CPR at MIT-EECS
- Subject: Re: COPYALL, COPYLIST, et alia
- From: George J. Carrette <GJC at MIT-MC>
- Date: Tue ,20 Jan 81 13:42:00 EDT
- Cc: LISP-FORUM at MIT-AI
Parameterized macros to the rescue.
((COPY CONS) X) => (CONS (CAR X) (CDR X))
((COPY CONS RIGHT-RECURSIVE) X) => (APPEND X NIL) ; almost!
((COPY CONS RECURSIVE) X) => (SUBST NIL NIL X) ; maybe
; does it stop at a non-cons, or at ATOM, or what?
The COPY-ALIST was a rigth-recursive copy with second-level
of ((COPY CONS) ...)
If we really want good names it sounds like a time to
go back to the basic generalizations of tree-recursion,
and come up with a compact naming convention for them.
Otherwise, we may be stuck with:
I doubt these copy functions are used very often. Mostly
they are used when funny RPLACing is going on in other places,
so having larger names might be a feature. The more expensive
functions should have larger names shouldn't the? (uhm...)