[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: If records are not sequences, why does aref work on records?
From: |
Clément Pit-Claudel |
Subject: |
Re: If records are not sequences, why does aref work on records? |
Date: |
Fri, 7 Apr 2017 13:59:43 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 2017-04-07 12:56, Paul Eggert wrote:
> How about if we define a new function record-ref to be used on
> records, instead of aref? At the low level this would insulate
> records better from the rest of Emacs Lisp, which I think is the
> intent -- as I understand it, records are supposed to be used to
> create new types, and are not supposed to be sorts of aliases for
> sequences.
Won't this break things, though? I thought cl-defstruct now produced record, so
will all code that used aref on cl-defstructs need to be updated?
(I use aref on things defined with cl-defstruct from time to time. The latest
example was a function on binary trees, defined as a union type of two records
(one type of record for branches, and one type of record for leaves). Both
types carried the same information in the first slot, which allowed me to
replace (if (branch-p x) (branch-v x) (leaf-v x)) by (aref x 1). This made a
difference, performance-wise.)
Cheers,
Clément.
- Re: If records are not sequences, why does aref work on records?, (continued)
- Re: If records are not sequences, why does aref work on records?, Clément Pit-Claudel, 2017/04/08
- Re: If records are not sequences, why does aref work on records?, Lars Brinkhoff, 2017/04/08
- Re: If records are not sequences, why does aref work on records?, Clément Pit-Claudel, 2017/04/08
- Re: If records are not sequences, why does aref work on records?, Lars Brinkhoff, 2017/04/08
- Re: If records are not sequences, why does aref work on records?, Richard Stallman, 2017/04/09
- Re: If records are not sequences, why does aref work on records?, Stefan Monnier, 2017/04/11
- Re: If records are not sequences, why does aref work on records?, Clément Pit-Claudel, 2017/04/07
- Re: If records are not sequences, why does aref work on records?, Noam Postavsky, 2017/04/07
- Re: If records are not sequences, why does aref work on records?, Clément Pit-Claudel, 2017/04/07
- Re: If records are not sequences, why does aref work on records?, Stefan Monnier, 2017/04/07
- Re: If records are not sequences, why does aref work on records?,
Clément Pit-Claudel <=
Re: Recent change in master breaks async package update using paradox, Lars Brinkhoff, 2017/04/07