Sorry, that's not my question, which doesn't involve protocols I don't own. Let
me restate. Given three types I don't own as follows:
```
struct A : Frobnicate {
override required func frobnicate() { print("A") } // "A", or delete to get
default
}
struct B: Frobnicate {
override required func frobnicate() { print("B") } // "B", or delete to get
default
}
struct C: Frobnicate { }
```
-- E
> On Apr 28, 2016, at 11:48 AM, Xiaodi Wu <[email protected]> wrote:
>
> Sorry, that's not my question, which doesn't involve protocols I don't own.
> Let me restate. Given three types I don't own as follows:
>
> ```
> struct A {
> func frobnicate() { print("A") }
> }
> struct B {
> func frobnicate() { print("B") }
> }
> struct C { }
> ```
>
> I want to conform them to a protocol of my own design, Frobnicatable, and
> supply a default `frobnicate()`:
>
> ```
> protocol Frobnicatable {
> func frobnicate()
> }
> extension Frobnicatable {
> func frobnicate() { print("Default") }
> }
> extension A: Frobnicatable { }
> extension B: Frobnicatable { }
> extension C: Frobnicatable { }
>
> let c = C()
> c.frobnicate() // "Default"
> ```
>
> (Yes, I realize there are issues regarding static and dynamic dispatch that
> limit the utility of this particular example--let's leave those aside for
> now.)
> Where would I affix keywords such as `required` and `override` to make this
> work after implementation of your proposal?
_______________________________________________
swift-evolution mailing list
[email protected]
https://lists.swift.org/mailman/listinfo/swift-evolution
