Xcode Version 9.0 (9A235)
Hmmm. I'm now getting a segmentation fault : 11 on a constructor when trying to
implement type erasure :
protocol DataProvider
{
associatedtype ItemType
subscript(index: Int) -> ItemType { get }
}
class _AnyDataProviderBoxBase<itemType>: DataProvider
{
subscript(index: Int) -> itemType
{
fatalError()
}
}
class _AnyDataProviderBox<providerType: DataProvider>:
_AnyDataProviderBoxBase<providerType.ItemType>
{
private let _subscript: (_ index: Int) -> providerType.ItemType
init(_ base: providerType) // segmentation fault : 11
{
_subscript = base.subscript
}
override subscript(index: Int) -> providerType.ItemType
{
return _subscript(index)
}
}
final class AnyDataProvider<providerType : DataProvider>: DataProvider
{
private let box: _AnyDataProviderBox<providerType>
init(_ base: providerType)
{
self.box = _AnyDataProviderBox(base)
}
subscript(index: Int) -> providerType.ItemType
{
return box[index]
}
}
Joanna
--
Joanna Carter
Carter Consulting
_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users
