> let fooIsNSString = foo is NSString // true
I don't understand. Why is so? On which version of Swift did you try this?
IBM Swift Sandbox
Swift Ver. 3.0 (Aug 23, 2016)
Platform: Linux (x86_64)
import Foundation
let foo: Any = "Foo"
let bar: Any = NSString(string: "Bar")
let fooIsString = foo is String
print(fooIsString) // true
let fooIsNSString = foo is NSString
print(fooIsNSString) // false! as expected
On 25.08.2016 22:40, Adrian Zubarev via swift-evolution wrote:
Is that what you guys wanted to achieve?
|@inline(never) func opaqueCast<T,U>(_ x: T, _: U.Type) -> Bool { return x
is U } let foo: Any = "Foo" let bar: Any = NSString(string: "Bar") let
fooIsString = foo is String // true opaqueCast(type(of: foo),
String.Type.self) // true let fooIsNSString = foo is NSString // true
opaqueCast(type(of: foo), NSString.Type.self) // false let barIsString =
bar is String // true opaqueCast(type(of: bar), String.Type.self) // false
let barIsNSString = bar is NSString // true opaqueCast(type(of: bar),
NSString.Type.self) // true |
Joe Groff showed me this little trick when |is| cast was bugged in some
Xcode beta for Swift 1.2.
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