[swift-users] Should Array's `append(_)` function cause `didSet`?

[Zhao Xin]

Thanks.

Zhao Xin

On Tue, Jul 11, 2017 at 2:29 AM, Jordan Rose <jordan_rose at apple.com> wrote:

>
>
> On Jul 7, 2017, at 22:50, Marco S Hyman via swift-users <
> swift-users at swift.org> wrote:
>
>
> On Jul 7, 2017, at 9:48 PM, Zhao Xin <owenzx at gmail.com> wrote:
>
> Thank you very much Marco. But What is  “outside of an initializer” really
> bothers me. **Both** `func bar(keysAndValues:Dictionary<String, String>)`
> works now. **Are they really outside ?**
>
>
> Uhhh, that is certainly not the results I’d have expected.  Perhaps one of
> the  swift language lawyers can explain.
>
>
> The goal is that once the initializer is completed all accesses will go
> through the setter and therefore trigger willSet/didSet behavior. Since a
> local function can be assigned to a property or something and get called
> later, it has to go through the setter as well. So the rules only apply to
> what's directly in the body of the initializer, not anything nested. (This
> includes closures, even.) It might be worth a bug against us at Apple to
> make this more explicit in the documentation, https://bugreport.apple.com.
>
> We also have a bug where 'defer' can trigger willSet and didSet behavior
> as well, SR-1437 <https://bugs.swift.org/browse/SR-1437>. But that really
> is just a bug.
>
> Jordan
>
>
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