[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Are two symbols `equal' iff they are `eq'?
From: |
Marcin Borkowski |
Subject: |
Re: Are two symbols `equal' iff they are `eq'? |
Date: |
Sun, 09 Aug 2015 17:45:31 +0200 |
On 2015-08-09, at 17:19, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Marcin Borkowski <mbork@mbork.pl>
>> Date: Sun, 09 Aug 2015 17:10:06 +0200
>>
>> tail_recurse:
>> QUIT;
>> if (EQ (o1, o2))
>> return 1;
>>
>> >From the capitalization I would guess that QUIT is a C macro. From its
>> name I would guess that anything after it is irrelevant;-). Well,
>> joking aside, I found its definition in the source; do I get it right
>> that it quits if something like C-g happens?
>
> Yes.
>
>> If yes, I'd be curious why it is here.
>
> To allow the user to interrupt a (potentially) long operation.
That's obvious, I just wondered why at this point.
>> Apart from that, it seems that I was right: `equal' for
>> symbols just calls `eq' (C EQ, not Lisp eq, to be more precise).
>
> What else could it possibly do?
It could e.g. compare the string representation, so two symbols with the
same name but in different obarrays, or one interned and the other not,
could be equal but not eq. (I'm not sure whether this would be useful,
though - just a thought.)
Regards,
--
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University
- RE: Are two symbols `equal' iff they are `eq'?, (continued)
- Re: Are two symbols `equal' iff they are `eq'?, Joost Kremers, 2015/08/08
- Re: Are two symbols `equal' iff they are `eq'?, Ian Zimmerman, 2015/08/09
- Re: Are two symbols `equal' iff they are `eq'?, Marcin Borkowski, 2015/08/09
- Re: Are two symbols `equal' iff they are `eq'?, Michael Heerdegen, 2015/08/09
- Re: Are two symbols `equal' iff they are `eq'?, Marcin Borkowski, 2015/08/09
- Re: Are two symbols `equal' iff they are `eq'?, Eli Zaretskii, 2015/08/09
- Re: Are two symbols `equal' iff they are `eq'?,
Marcin Borkowski <=
- Re: Are two symbols `equal' iff they are `eq'?, Eli Zaretskii, 2015/08/09
- Re: Are two symbols `equal' iff they are `eq'?, Marcin Borkowski, 2015/08/09
- Re: Are two symbols `equal' iff they are `eq'?, Nicolas Richard, 2015/08/10
Message not available
Re: Are two symbols `equal' iff they are `eq'?, Marcin Borkowski, 2015/08/09
Message not available