> On Mar 23, 2016, at 10:13 AM, Joanna Carter via swift-evolution
> <[email protected]> wrote:
>
> I'm not sure if this is an appropriate conversation to bring this up on but,
> here goes.
>
> I have a need, for serialisation and various other uses, to be able to create
> an instance of a generic type, with the parameter type(s) stored in (a)
> var(s) of Any.Type.
>
> Typically, the origin of the metatype is something like a Mirror's
> subjectType property.
>
> Some of the proposals for Swift 3 seem to touch on similar needs but I was
> not sure whether to pollute those discussions or not
You can accomplish this with Swift today by casting your Any.Type to a
Protocol.Type that provides an initializer:
protocol Deserializable {
init(deserializedFrom stream: DeserializationStream)
}
func deserializeValue(type type: Any.Type, from stream: DeserializationStream)
-> Any? {
if let deserializableType = type as? Deserializable.Type {
return deserializableType.init(deserializedFrom: stream)
}
return nil
}
-Joe
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