Hi,
I don't understand your comment, can you explain some more please?
Thanks,
-- Howard.
On Monday, 21 March 2016, zh ao <owe...@gmail.com> wrote:
> You protocol is not defined properly.
>
> On Mon, Mar 21, 2016 at 7:08 AM, Howard Lovatt via swift-users <
> swift-users@swift.org
> <javascript:_e(%7B%7D,'cvml','swift-users@swift.org');>> wrote:
>
>> HI,
>>
>> Does anyone know what is happening here:
>>
>> protocol Subscriptable {
>>
>> associatedtype Element
>>
>> associatedtype Index
>>
>> var firstIndex: Index { get }
>>
>> var lastIndex: Index { get }
>>
>> subscript(index: Index) -> Element { get set }
>>
>> }
>>
>>
>> struct AllSubscriptable<E, I>: Subscriptable {
>>
>> typealias Element = E
>>
>> typealias Index = I
>>
>> let firstIndexee: () -> I
>>
>> let lastIndexee: () -> I
>>
>> let subscriptee: (index: I) -> E
>>
>> let setSubscriptee: (index: I, element: E) -> Void
>>
>> var firstIndex: I { return firstIndexee() }
>>
>> var lastIndex: I { return lastIndexee() }
>>
>> subscript(index: I) -> E {
>>
>> get { return subscriptee(index: index) }
>>
>> set { setSubscriptee(index: index, element: newValue) }
>>
>> }
>>
>> }
>>
>>
>> extension Array {
>>
>> var asScriptable: AllSubscriptable<Element, Int> {
>>
>> return AllSubscriptable(
>>
>> firstIndexee: { return self.startIndex }, // Error: Cannot
>> convert `() -> Int` to expected `() -> _`
>>
>> lastIndexee: { return self.endIndex },
>>
>> subscriptee: { return self[$0] },
>>
>> setSubscriptee: { self[$0] = $1 }
>>
>> )
>>
>> }
>>
>> }
>>
>>
>> The error, "Cannot convert `() -> Int` to expected `() -> _`", on the
>> `firstIndexee` closure is very strange since the types are correct and the
>> same as `lastIndexee` which does not have an error.
>>
>> Also if the set subscript in Subscriptable and then all the other set
>> support in AnySubscriptabe and in the extension is removed, then no error.
>>
>> Any clues to why?
>>
>> -- Howard.
>>
>> _______________________________________________
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>> swift-users@swift.org
>> <javascript:_e(%7B%7D,'cvml','swift-users@swift.org');>
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>>
>>
>
--
-- Howard.
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