On Mar 18, 2014, at 9:29 PM, Luther Baker <lutherba...@gmail.com> wrote:
> On Tue, Mar 18, 2014 at 8:11 PM, Kyle Sluder <k...@ksluder.com> wrote: > On Tue, Mar 18, 2014, at 05:30 PM, William Squires wrote: > > Hi all! > > Obviously (IIRC) a pure abstract class would map to a formal protocol > > in ObjC (or a class interface in languages such as REALbasic/Xojo, or > > VB 6). My best guess is to: > > No, that's not what protocols are for. Any class can conform to any > protocol. > > > Mmmm ... well, generally speaking, any class can "conform" to any abstract > class as well. I believe that one distinction is that an Objective-C @class > can conform to an endless number of @protocols while a Java class can only > directly subclass ONE abstract class, pure or not. But similarly, in > Objective-C, a @class can subclass only one @class at a time. > > A _better_ analogy to an Objective-C @protocol would be a formal Java > interface. > > So, Kyle may have good reasons for his answer - but if I understand the > essence of your question, I would say yes, a pure "abstract class" (where no > methods are implemented) or a formal "interface" (where method signatures > have no implementation) in a language like Java ... would both indeed be > _similar_ to a formal @protocol in Objective-C. > > And as I think I hear in your voice, the essence is that the interface, pure > abstract class or protocol ALL declare a formal contract or API that some > other concrete class implements, adopts or conforms to. Pick your terms but > indeed the language constructs you've listed here are, at some level, > analogous. > > And yes, I think your Objective-C attempt to replicate the notion of an > abstract class in Java demonstrates an understanding of protocols and classes > in Objective-C. It is clearly a sort of "blend" of the two. > > Hope that helps. > -Luther > Oh goody, time to go refactor some code, then... Off I go. :) _______________________________________________ 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
