> Update your where clause to:
> where Type: PluginDataProtocol, Type.Parent == Monster {
Thank you, '==' works! I tried "Type.Parent: Monster" before which didn't
compile.
Regards,
Andrey
> On 1 Feb 2017, at 00:27, Hooman Mehr <[email protected]> wrote:
>
> Update your where clause to:
>
> where Type: PluginDataProtocol, Type.Parent == Monster {
>
>
>> On Jan 31, 2017, at 10:36 AM, Andrey Fidrya via swift-users
>> <[email protected] <mailto:[email protected]>> wrote:
>>
>> Hi All,
>>
>> I've encountered a very strange problem where generic initializer's
>> parameter type isn't resolved correctly unless explicitly casted.
>>
>> Below is playground code for reproducing the problem and compiler error I'm
>> getting.
>> After removing "as! Type.Parent" cast the code won't compile anymore...
>>
>> It expects Type.Parent and I'm passing Monster, but Parent is typealiased to
>> Monster.
>> Why can't it infer the type automatically?
>>
>>
>> public protocol PluginDataProtocol: class {
>> associatedtype Parent
>> init(parent: Parent)
>> }
>>
>> public class Monster {
>> public var pluginsData = [ObjectIdentifier: AnyObject]()
>>
>> public func pluginData<Type>(id: ObjectIdentifier =
>> ObjectIdentifier(Type.self)) -> Type
>> where Type: PluginDataProtocol {
>> if let data = pluginsData[id] as? Type {
>> return data
>> } else {
>> let data = Type(parent: self as! Type.Parent)
>> pluginsData[id] = data
>> return data
>> }
>> }
>> }
>>
>> final class MyMonsterPluginData: PluginDataProtocol {
>> typealias Parent = Monster
>>
>> weak var parent: Parent?
>>
>> init(parent: Parent) {
>> self.parent = parent
>> }
>> }
>>
>> Compiler error:
>>
>> Playground execution failed: error: Generics.playground:14:24: error: cannot
>> invoke initializer for type 'Type' with an argument list of type '(parent:
>> Monster)'
>> let data = Type(parent: self /* as! Type.Parent */)
>> ^
>>
>> Generics.playground:14:24: note: expected an argument list of type '(parent:
>> Self.Parent)'
>> let data = Type(parent: self /* as! Type.Parent */)
>>
>>
>> Regards,
>> Andrey
>>
>>
>>
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>
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