> On Aug 21, 2015, at 20:06 , Greg Parker <gpar...@apple.com> wrote: > > >> On Aug 21, 2015, at 6:15 PM, Rick Mann <rm...@latencyzero.com> wrote: >> >>> On Aug 21, 2015, at 18:13 , Quincey Morris >>> <quinceymor...@rivergatesoftware.com> wrote: >>> >>> I’d recommend you try to avoid calling the Swift side “exceptions”. It’s >>> error handling, and although it’s not completely unlike exception handling >>> in other (non-Obj-C) languages, it’s treacherous to confuse the two when >>> dealing with Obj-C. >> >> Really? It sure seems to be precisely an exception, in that it's an >> exception to the "normal" flow of control (e.g. return). Just because the >> type of what's thrown is called "Error" doesn't change the fact that they're >> conceptually exceptions (as opposed to, say, returning a boolean true/false >> to indicate an error). > > We avoid the word "exception" for Swift's error handling. > > The fundamental feature of exception systems is that the call site need not > do anything. If the call site does nothing, the exception automatically > unwinds past it. There is no syntactic difference between a call site that > may throw and a call site that will never throw. > > Swift's error handling is different: the possibility of error is explicit at > the call site. Some people think this is better (no invisible execution > paths) and some people think it is worse (too noisy). Either way the model is > different enough that we don't call it exception handling. > > The fact that Swift's errors map to Objective-C NSError instead of > Objective-C exceptions is another reason to avoid "exception".
Okay, so an Objective-C method that throws an exception...what happens? Also, if the method of the call site is marked as "throws," does that mean the error will propagate out? Pity it's not a real exception mechanism. -- Rick Mann rm...@latencyzero.com _______________________________________________ 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/archive%40mail-archive.com This email sent to arch...@mail-archive.com
