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bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object.
From: |
Noam Postavsky |
Subject: |
bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object. |
Date: |
Tue, 28 Nov 2017 20:09:39 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux) |
pierre.techoueyres@free.fr (Pierre Téchoueyres) writes:
> I try to understand how, from print_object, objects in the hash table
> are print.
> I expected something like
>
> prin1 -> print -> print_object -> something in lisp or C
The sequence is
prin1 -> print -> print_object -> print_vectorlike
print_vectorlike calls print_object on all of the keys and values of the
hashtable (see 'case PVEC_HASH_TABLE').
> I'm trying to make pcache work correctly with emacs 26.
> Now I understand that eieio--class and eieio--class-tag have changed,
> but I don't know if I can or how to correct the printing of objects in
> order to read them back with eieio-persistent-read.
I see 3 possibilities:
1. Make eieio persistent save stuff use cl-print to print the whole
thing readably (this requires major additions to cl-print, currently it
doesn't preserve readability except by just punting to prin1).
2. Change the class tag to something that will be easily readable, and
round-trip as eq (i.e., some kind of symbol, like in Emacs 25 and
earlier).
3. Change child-of-class-p to use `equal'ness instead of `eq'ness for
classes. I think would require an `equal' that can handle circular
objects.
Looks like #2 would be the easiest to implement.
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., (continued)
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Eric Abrahamsen, 2017/11/17
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Noam Postavsky, 2017/11/18
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Eric Abrahamsen, 2017/11/18
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Noam Postavsky, 2017/11/18
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Eric Abrahamsen, 2017/11/19
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Pierre Téchoueyres, 2017/11/23
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Noam Postavsky, 2017/11/23
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Pierre Téchoueyres, 2017/11/28
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Noam Postavsky, 2017/11/28
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Pierre Téchoueyres, 2017/11/28
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object.,
Noam Postavsky <=
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Stefan Monnier, 2017/11/29
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Eric Abrahamsen, 2017/11/28
- bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object., Stefan Monnier, 2017/11/29