Re: VC# vs. ObjC and partial abstract classes
Re: VC# vs. ObjC and partial abstract classes
- Subject: Re: VC# vs. ObjC and partial abstract classes
- From: William Squires <email@hidden>
- Date: Wed, 19 Mar 2014 10:43:24 -0500
On Mar 18, 2014, at 9:29 PM, Luther Baker <email@hidden> wrote:
> On Tue, Mar 18, 2014 at 8:11 PM, Kyle Sluder <email@hidden> 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 (email@hidden)
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:
This email sent to email@hidden