From: Philipp Stephani <p.stephani2@gmail.com>
To: Yuan Fu <casouri@gmail.com>
Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
Subject: Re: Plist-put changes literal argument
Date: Sat, 5 Sep 2020 17:55:20 +0200 [thread overview]
Message-ID: <CAArVCkSzpugdW_cv6TXTu6NbNk+k86NGgKk1AFOp5ieONaOPAg@mail.gmail.com> (raw)
In-Reply-To: <55491E0C-FFDF-43F8-853E-1CC826485D40@gmail.com>
Am Do., 3. Sept. 2020 um 02:18 Uhr schrieb Yuan Fu <casouri@gmail.com>:
>
> >
> > I also tried setcar, same result. So Elisp doesn’t copy arguments?
> >
> > Yuan
>
>
> Ok, think more of it, it would be weird to make a full copy of cons (and other non-primitive values) on function call. I wonder how do other languages deal with this, because I never run into problems like this (except for in Python, with its default argument values).
Most other languages don't have literals of mutable types; or, if they
do, they create a new object for each evaluation of the literal
expression.
next prev parent reply other threads:[~2020-09-05 15:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-02 23:55 Plist-put changes literal argument Yuan Fu
2020-09-02 23:59 ` Yuan Fu
2020-09-03 0:18 ` Yuan Fu
2020-09-03 0:53 ` Noam Postavsky
2020-09-05 15:55 ` Philipp Stephani [this message]
2020-09-06 15:23 ` Yuan Fu
2020-09-05 15:53 ` Philipp Stephani
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