> On Dec 10, 2017, at 4:47 PM, Brent Royal-Gordon <[email protected]>
> wrote:
>
>> On Dec 5, 2017, at 2:28 PM, Douglas Gregor via swift-dev
>> <[email protected] <mailto:[email protected]>> wrote:
>>
>> To perform that mapping from a mangled type in a conditional requirement to
>> type metadata, we effectively need an operation to take a mangled type name
>> and turn it into a type metadata pointer. This is something we could surface
>> in the Swift standard library/runtime as, e.g.,
>>
>> func type(named: String) -> Any.Type?
>>
>> to take a mangled type name and try to get the type metadata for it. From
>> there, one can query protocol conformances that (say) allow one to construct
>> instances of the arbitrarily-named type. Think of it as NSClassFromString
>> for any type in the Swift language, including specializations of generic
>> types.
>
>
> It's worth noting here that the standard library already provides a limited
> `_typeByName(_:)` function for Corelibs Foundation to use. That function will
> presumably become part of the ABI unless we design a public version in Swift
> 5.
Woah. That’s kinda awful… it parses “Foo.Bar” as a class name and looks for
class Bar in module Foo.
- Doug
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