Re: Language options: Objective-C, Swift, C or C++?
Re: Language options: Objective-C, Swift, C or C++?
- Subject: Re: Language options: Objective-C, Swift, C or C++?
- From: Quincey Morris <email@hidden>
- Date: Tue, 16 Jun 2015 07:58:55 +0000
On Jun 16, 2015, at 00:34 , Roland King <email@hidden> wrote:
>
> I think Protocol Extensions are the power feature to Swift this year
Yes, though I’ve been trying to convert a fair-sized app, and I ran into a conceptual difficulty when a protocol has a Self constraint.
In essence, a Self constraint prevents a protocol from being used like a base class. This shows up quickly when (say) you try to construct a Set<MyProtocol> which is going to contain various types that are unified only by MyProtocol. The underlying Set class has to Hashable, which means its also Equatable, which has a Self requirement to ensure that two objects being compared by == are of the same type.
You’d see this problem with the example in that video if you tried to make the SegueIdentifier protocol Hashable or Equatable.
Other really good features: value-type programming, and the ‘guard’ statement, which is much better in use than you’d expect.
The other major problem I ran into — unrelated, but I’m mentioning it in case someone wants to jump in and tell me the easy way — is that I’m trying to use frameworks in order to break the project into modules so that I can use the access controls (private and internal) to keep implementation details of related groups of files out of the grasp of unrelated code. This is in a cross-platform (OS X, iOS) project with shared code. Since the different platforms need different frameworks, and the frameworks/modules have to have different names to tell them apart, I can’t share source code files across platforms because of the “import” statements. Maybe I’m missing something obvious here.
> And now I know what Kyle looks like too!
What’s the video?
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| References: | |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: Roland King <email@hidden>) |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: Quincey Morris <email@hidden>) |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: Graham Cox <email@hidden>) |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: Michael David Crawford <email@hidden>) |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: Carl Hoefs <email@hidden>) |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: "Gary L. Wade" <email@hidden>) |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: Quincey Morris <email@hidden>) |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: Carl Hoefs <email@hidden>) |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: Rick Mann <email@hidden>) |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: Quincey Morris <email@hidden>) |
| | >Re: Language options: Objective-C, Swift, C or C++? (From: Roland King <email@hidden>) |