From: Stefan Monnier <monnier@iro.umontreal.ca>
To: "Stephen J. Turnbull" <stephen@xemacs.org>
Cc: David Kastrup <dak@gnu.org>,
Artur Malabarba <bruce.connor.am@gmail.com>,
emacs-devel <emacs-devel@gnu.org>
Subject: Re: Merging nth, aref, and elt.
Date: Fri, 31 Oct 2014 23:19:16 -0400 [thread overview]
Message-ID: <jwva94b7gus.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87bnor3eyt.fsf@uwakimon.sk.tsukuba.ac.jp> (Stephen J. Turnbull's message of "Sat, 01 Nov 2014 10:08:10 +0900")
> But note that (get not-necessarily-symbolp-obj 0) has a gotcha: for
> sequences 0 means the first object when iterating, for hashes and
> symbols it means the value of the mapping at the object which
> represents the integer 0 (which happens to be unique in Lisp). So
> it's potentially ambiguous.
I don't see any ambiguity there: sequences are mappings from integers
to objects. There are ambiguities tho if we try to use `get' for
everything like hash tables, array, lists, symbol properties, window
parameters, buffer-local variables, object fields, ...:
- we can't reliably distinguish a list from an alist.
- we can't reliably distinguish a defstruct object from an array.
Stefan
next prev parent reply other threads:[~2014-11-01 3:19 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-29 21:40 Merging nth, aref, and elt Artur Malabarba
2014-10-30 1:52 ` Stefan Monnier
2014-10-30 9:51 ` David Kastrup
2014-10-30 13:30 ` Artur Malabarba
2014-10-31 19:13 ` Stefan Monnier
2014-10-31 19:56 ` Stefan Monnier
2014-11-01 1:08 ` Stephen J. Turnbull
2014-11-01 3:19 ` Stefan Monnier [this message]
2014-12-13 4:09 ` Artur Malabarba
2014-12-14 3:57 ` Stefan Monnier
2014-12-14 11:23 ` Nicolas Petton
2014-12-14 13:47 ` Stefan Monnier
2014-12-18 16:01 ` Artur Malabarba
2014-12-18 19:12 ` Stefan Monnier
2014-12-19 1:37 ` Ted Zlatanov
2015-01-11 13:58 ` Nicolas Petton
2015-01-12 5:28 ` Stefan Monnier
2015-01-12 9:29 ` Nicolas Petton
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