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From: Ihor Radchenko <yantar92@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: rms@gnu.org,  schwab@suse.de,  emacs-devel@gnu.org
Subject: Re: Comparing hash table objects
Date: Sun, 12 Jun 2022 17:16:36 +0800	[thread overview]
Message-ID: <87zgiip7gr.fsf@localhost> (raw)
In-Reply-To: <jwvv8t7chvr.fsf-monnier+emacs@gnu.org>

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> However, it will not help with the problem of comparing objects
>> containing hash tables. Unless those obejcts also define special
>> comparison function (which is inconvenient).
>
> This is an instance of a fairly general problem with Lisp's equality
> tests (and it's not really specific to Lisp, admittedly).
>
> Maybe a half-sane way to solve this problem is to provide a generic
> "equality driver" which takes an argument specifying which objects to
> compare for structural equality (i.e. where to keep recursing).

This might be an option.
It would then help if cl-defstruct supported a default comparator
setting the "equality driver" to be used by default when comparing the
objects using equal.

Best,
Ihor



  reply	other threads:[~2022-06-12  9:16 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-08  8:41 Comparing hash table objects Ihor Radchenko
2022-06-08  8:51 ` Andreas Schwab
2022-06-08  9:17   ` Ihor Radchenko
2022-06-10 22:45     ` Richard Stallman
2022-06-11  5:52       ` Ihor Radchenko
2022-06-11 16:04         ` Stefan Monnier
2022-06-12  9:16           ` Ihor Radchenko [this message]
2022-06-12 23:55           ` Sam Steingold
2022-06-13 13:02             ` Stefan Monnier
2022-06-13 16:18               ` Sam Steingold
2023-05-15  5:56 ` bug#63513: [PATCH] Make persist-defvar work with records and hash tables Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-05-15 11:31   ` Eli Zaretskii
2023-05-23 20:14     ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-02 23:54       ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-03  6:08         ` Eli Zaretskii
2023-09-04  0:29           ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-04 11:33             ` Eli Zaretskii
2023-09-04 15:57               ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-04 17:05                 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-04 22:28                   ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-05 21:06                     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-08 11:30                       ` Ihor Radchenko
2023-09-08 11:58                         ` Eli Zaretskii
2023-09-08 12:06                           ` Ihor Radchenko
2023-09-08 12:46                             ` Eli Zaretskii
2023-09-08 12:51                               ` Ihor Radchenko
2023-09-08 16:36                         ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-08 17:06                           ` Ihor Radchenko
2023-09-08 17:10                             ` Joseph Turner via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-09-09 10:01                               ` Ihor Radchenko
2023-09-09 10:15                                 ` Daniel Mendler
2023-09-09 11:35                                   ` Ihor Radchenko
2023-09-09 11:57                                     ` Daniel Mendler
2023-09-09 12:12                                       ` compat.el and Emacs unstable master branch features (was: bug#63513: [PATCH] Make persist-defvar work with records and hash tables) Ihor Radchenko
2023-09-09 12:29                                         ` Daniel Mendler
2023-09-09 16:52                                           ` Joseph Turner
2023-09-11  8:45                                           ` Ihor Radchenko
2023-09-12 10:02                                             ` compat.el and Emacs unstable master branch features Philip Kaludercic
2023-09-12 10:27                                               ` Daniel Mendler
2023-09-13 10:31                                                 ` Philip Kaludercic
2023-09-13 17:11                                                   ` Daniel Mendler
2023-10-15  8:43                                                     ` Ihor Radchenko
2023-10-15 12:09                                                       ` Philip Kaludercic
2023-09-05 15:08                   ` bug#63513: [PATCH] Make persist-defvar work with records and hash tables phillip.lord

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