>>>>> "PC" == Piers Cawley <[EMAIL PROTECTED]> writes:
PC> Uri Guttman <[EMAIL PROTECTED]> writes: >> >> but lisp dotted pair actually only can hold scalars in each node >> too. each node could be a pointer to other stuff or a value. that is >> classic lisp data structures, all things are trees or lists made from >> pairs. PC> Unless I'm completely misunderstanding the lisp refs I've been reading PC> recently, a scheme pair is restricted to holding pointers. Either to PC> other pairs or to things. If you represent it as an array, then you PC> can have: PC> [\"string", $next_pair is reference] PC> but you couldn't have: PC> ["car", $cdr is referent] PC> But I could be *way* off the mark there. that is sorta what i meant by scalars there. i should have been clearer. a dotted pair is a pair of pointers but a perl 6 pair is a pair of full scalars. but even so, a PMC would need 2 pointer slots for a dotted pair. one could be the data slot (points to string buffer, etc.) the other could be this new PMC pointer slot that can double as the cdr of a dotted pair. uri -- Uri Guttman ------ [EMAIL PROTECTED] -------- http://www.stemsystems.com -- Stem is an Open Source Network Development Toolkit and Application Suite - ----- Stem and Perl Development, Systems Architecture, Design and Coding ---- Search or Offer Perl Jobs ---------------------------- http://jobs.perl.org
