From: Artur Malabarba <bruce.connor.am@gmail.com>
To: David Kastrup <dak@gnu.org>
Cc: emacs-devel <emacs-devel@gnu.org>
Subject: Re: What's up with apply-partially?
Date: Sat, 24 Jan 2015 01:53:36 -0200 [thread overview]
Message-ID: <CAAdUY-KA5Chx0n4+ZxGG6e30Hx2iHc2sdghLcZh9UV5vHzz3XA@mail.gmail.com> (raw)
In-Reply-To: <874mrh5emp.fsf@fencepost.gnu.org>
> So why not just
>
> (defun apply-partially (fun &rest args)
> (lambda (&rest args2) (apply fun (append args args2))))
>
> Where is the point in the complicated redefinition that returns a
> basically uncompiled function? Why not just take Eli's definition and
> simplify it in line with lexical-binding now being set?
As Leo mentioned, the current definition creates the argument list
when `apply-partially' is first called, whereas your suggestion has to
call `append' everytime the returned function is called.
I think that's the only reason. It's unclear to me how that
performance difference compares with the disadvantage of the returned
function not being compiled.
prev parent reply other threads:[~2015-01-24 3:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-23 22:14 What's up with apply-partially? David Kastrup
2015-01-24 3:05 ` Leo Liu
2015-01-24 5:01 ` Stefan Monnier
2015-01-24 8:54 ` David Kastrup
2015-01-25 14:32 ` Stefan Monnier
2015-01-25 19:45 ` [PATCH] Let apply-partially make use of lexical binding in subr.el David Kastrup
2015-01-27 16:12 ` David Kastrup
2015-01-29 15:01 ` Stefan Monnier
2015-01-29 15:17 ` David Kastrup
2015-02-05 17:55 ` David Kastrup
2015-01-24 3:53 ` Artur Malabarba [this message]
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