[swift-evolution] [Pitch] Extend Any.Type to allow construction of bound generic types
Patrick Smith
pgwsmith at gmail.com
Wed Apr 20 18:07:01 CDT 2016
If I needed functionality like this, I would create an enum with a case and associated value for every type I needed.
enum AnyValue : Equatable { case int(Int) case string(String) // etc}
Patrick
On Sun, Apr 17, 2016 at 7:13 AM -0700, "Joanna Carter via swift-evolution" <swift-evolution at swift.org> wrote:
I often find myself needing to construct an instance of a bound generic type at runtime, in much the same manner as I would a "standard" type.
e.g.
As for a standard type…
let aType = Int.Type
let anInt = aType.init(0)
I also want to be able to use the same mechanism for a generic type…
struct MyStruct
{
var value: T?
}
let paramType = // type from streaming or reflection compliant with Equatable
let structType = MyStruct.self
let f = structType.init()
At present, the following compiler error is raised…
'paramType' is not a type
I am the only one to require this behaviour? If not, do we want a proposal? If so, could you let me know your views on its worthiness?
Joanna
--
Joanna Carter
Carter Consulting
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