From: Alan Third <alan@idiocy.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: phst@google.com, Philipp Stephani <p.stephani2@gmail.com>,
emacs-devel@gnu.org
Subject: Re: [PATCH] Allow inserting non-BMP characters
Date: Tue, 26 Dec 2017 21:36:42 +0000 [thread overview]
Message-ID: <20171226213642.GB82103@breton.holly.idiocy.org> (raw)
In-Reply-To: <83zi65grxv.fsf@gnu.org>
On Tue, Dec 26, 2017 at 10:22:36PM +0200, Eli Zaretskii wrote:
> > Message (method) invocations in Objective-C have high overhead because they are late-bound. Therefore it is
> > advisable to minimize the number of messages sent.
> > https://developer.apple.com/documentation/foundation/nsstring/1408720-getcharacters?language=objc also
> > indicates that a (properly implemented) getCharacters call is faster than calling characterAtIndex in a loop.
>
> Is that a fact, or should we measure that?
Apple’s documentation says to put it in a buffer:
If you want to iterate over the characters of a string, one of the
things you should not do is use the characterAtIndex: method to
retrieve each character separately. This method is not designed for
repeated access. Instead, consider fetching the characters all at once
using the getCharacters:range: method and iterating over the bytes
directly.
https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/CocoaPerformance/Articles/StringDrawing.html#//apple_ref/doc/uid/TP40001445-112378
--
Alan Third
next prev parent reply other threads:[~2017-12-26 21:36 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-24 16:00 bug#29837: UTF-16 char display problems and the macOS "character palette" Alan Third
2017-12-24 16:56 ` Eli Zaretskii
2017-12-24 18:23 ` Alan Third
2017-12-24 18:57 ` Eli Zaretskii
2017-12-24 19:28 ` Alan Third
2017-12-24 19:34 ` Eli Zaretskii
2017-12-25 20:13 ` Philipp Stephani
2017-12-25 21:01 ` [PATCH] Allow inserting non-BMP characters Philipp Stephani
2017-12-26 1:26 ` Alan Third
2017-12-26 4:46 ` Eli Zaretskii
2017-12-26 10:35 ` Philipp Stephani
2017-12-26 16:11 ` Eli Zaretskii
2017-12-26 18:50 ` Philipp Stephani
2017-12-26 20:22 ` Eli Zaretskii
2017-12-26 21:36 ` Alan Third [this message]
2017-12-27 3:41 ` Eli Zaretskii
2017-12-28 11:38 ` Alan Third
2017-12-28 12:31 ` Philipp Stephani
2017-12-28 16:29 ` Eli Zaretskii
2017-12-29 20:14 ` Philipp Stephani
2017-12-29 20:27 ` Eli Zaretskii
2018-01-07 15:51 ` Philipp Stephani
2018-01-07 17:40 ` Eli Zaretskii
2018-01-07 18:44 ` Philipp Stephani
2017-12-25 21:07 ` bug#29837: UTF-16 char display problems and the macOS "character palette" Philipp Stephani
2017-12-26 1:34 ` Alan Third
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