[swift-evolution] [Proposal] Property behaviors

cocoadev at charlessoft.com cocoadev at charlessoft.com
Wed Jan 13 18:04:35 CST 2016

I like it. A lot.



On 2016-01-13 17:07, Joe Groff via swift-evolution wrote:
> Thanks everyone for the first round of feedback on my behaviors
> proposal. I've revised it with the following changes:
> - Instead of relying on mapping behaviors to function or type member
> lookup, I've introduced a new purpose-built 'var behavior'
> declaration, which declares the accessor and initializer requirements
> and provides the storage and behavior methods of the property. I think
> this gives a clearer design for authoring behaviors, and allows for a
> more efficient and flexible implementation model.
> - I've backed off from trying to include 'let' behaviors. As many of
> you noted, it's better to tackle immutable computed properties more
> holistically than to try to backdoor them in.
> - I suggest changing the declaration syntax to use a behavior to
> square brackets—'var [behavior] foo'—which avoids ambiguity with
> destructuring 'var' bindings, and also works with future candidates
> for behavior decoration, particularly `subscript`.
> Here's the revised proposal:
> https://gist.github.com/jckarter/50b838e7f036fe85eaa3
> For reference, here's the previous iteration:
> https://gist.github.com/jckarter/f3d392cf183c6b2b2ac3
> Thanks for taking a look!
> -Joe
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