> On Apr 28, 2016, at 8:09 PM, Erica Sadun via swift-evolution
> <[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 : 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 { }
> ```
These are a couple of derived situations:
> struct IAssumeThisIsAProblem : Frobnicate {
> required func frobnicate() { print("A") }
> }
> struct IAssumeThisIsAnotherProblem Frobnicate {
> override func frobnicate() { print("A") }
> }
What happens in both cases?
>
> -- 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?
>
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