Article View: comp.lang.misc
Article #2236Re: Some things that pointer-less languages can't do efficiently
From: Peter da Silva
Date: Fri, 23 Nov 1990 17:44
Date: Fri, 23 Nov 1990 17:44
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1245 bytes
In article <3808@skye.ed.ac.uk> jeff@aiai.UUCP (Jeff Dalton) writes: > What you can't do is: > (setq a '(some list)) > (setq b (pointer-to (cdr a))) But "a" is already a "pointer" to "cdr a". In this case the "reference" operation is simply "cdr". You want to factor the pointer out of the cons. I don't care if you can or not: the cons already has the same semantics as a pair of pointers, and everything that can be said "about" pointers can be said "about" a cons. -- Peter da Silva. `-_-' +1 713 274 5180. 'U` peter@ferranti.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!lavaca.uh.edu!menudo.uh.edu!sugar!ficc!peter From: peter@ficc.ferranti.com (Peter da Silva) Newsgroups: comp.lang.misc Subject: Re: Some things that pointer-less languages can't do efficiently Message-ID: <5P57P18@xds13.ferranti.com> Date: 23 Nov 90 17:44:49 GMT References: <26739:Oct1023:44:2690@kramden.acf.nyu.edu> <65450@lanl.gov> <10397:Oct1212:55:1090@kramden.acf.nyu.edu> <3975@goanna.cs.rmit.oz.au> <3716@skye.ed.ac.uk> <HEZ6WP9@xds13.ferranti.com> <3808@skye.ed.ac.uk> Reply-To: peter@ficc.ferranti.com (Peter da Silva) Organization: Xenix Support, FICC Lines: 12