On Jan 29, 2014, at 6:41 PM, Uli Kusterer <witness.of.teacht...@gmx.net> wrote:
> On 30 Jan 2014, at 00:16, Rui Pacheco <rui.pach...@gmail.com> wrote: >> To those of you doing Objective-C++ apps, is there a difference in terms of >> performance or memory usage? >> >> I’ve noticed that TextMate 2, which is done in Objective-C++, consumes less >> memory than the Chocolat editor which seems to be done exclusively in Cocoa. > > Give the nature of C++, it’s not surprising that performance can often be > better. They generally tend to put a higher emphasis on performance than on > programmer comfort, maintainability etc. Also, C++ can do a lot of mean > tricks due to the more static nature of the language. E.g. their method > dispatch is not easy to keep binary stable across releases, so is really > badly suited for API design in dylibs or frameworks, but probably only needs > two pointer dereferences and one addition to resolve a method, while ObjC > actually has to perform the look-up at runtime, but therefore works much > better as a library API. > > I don’t usually have to drop down to C++ unless: > > 1) I’m in very performance-critical code, like device drivers, video decoders > etc. > 2) I need my code to be cross-platform, because C++ is really the most > reliably available OO-language everywhere from Android to Windows to iOS. > > Unless you’re in one of those situations, I wouldn’t drop down to C++ just > because it “is probably faster”. It helps nobody if your app crashes faster > because all that code you rewrote that you’d get for free in ObjC or C# or > the ADK is buggy. The more people use a piece of code, the more likely it is > one of them found a bug got it fixed. Tested code is always better than new, > “fast” code. Unfortunately, sometimes you have to use C++, because there are many cool and useful libraries for it, as I’m sure most of you know. Many people (but not all) use C++ not because they want to or think it’s “fast”, but because they have to to leverage an existing library or codebase. > > Cheers, > -- Uli Kusterer > “The Witnesses of TeachText are everywhere...” > http://zathras.de > > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/cocoa-dev/sevenbitstech%40gmail.com > > This email sent to sevenbitst...@gmail.com
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