[swift-evolution] [Discussion] Seal `T.Type` into `Type<T>`

Adrian Zubarev adrian.zubarev at devandartist.com
Thu Jul 14 16:20:02 CDT 2016

I must correct the dynamicType implementation. It’s true that the function will produce Type<T> but we still need to extract the dynamic metatype from the value, store it in _underlyingMetatype and recalculate _uniqueIdentifier.

public func `dynamicType`<T>(_ instance: T) -> Metatype<T> {
    let dynamicMetatype = /* extract from `instance` */
    let rawPointerMetatype = unsafeBitCast(dynamicMetatype, to: Builtin.RawPointer.metatype)
    var type = Type<T>()
    type._underlyingMetatype = dynamicMetatype
    type._uniqueIdentifier = Int(Builtin.ptrtoint_Word(rawPointerMetatype))
    return type

Adrian Zubarev
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