> On May 23, 2016, at 12:25 PM, Ryan Lovelett via swift-users
> <swift-users@swift.org> wrote:
>
> However it seems that Foundation on Linux has neither
> `CFBooleanGetTypeID` or `CFGetTypeID`.
Those are part of CoreFoundation, the C library on which the Mac/iOS Foundation
framework is built. The two have a complicated relationship; Foundation exposes
most but not all of the CoreFoundation APIs as Objective-C, but there are still
some features you have to drop down to C to use. This is one.
But I think you’re using the in-development Swift Foundation? That’s a
different implementation entirely. Presumably it will have some API of its own
to determine the type of a number.
—Jens
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