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df4429fc5d
We decided that classes and Objective-C existentials are always going to be bridged verbatim, ignoring any _BridgedToObjectiveC conformances. While the compiler isn't preventing conformance of a class type to _BridgedToObjectiveC, we ignore this case and will find a way to lock it down if _BridgedToObjectiveC loses its underscore. The motivation here is that (1) we don't really have a use case for a class that bridges to Objective-C in any way other than just being an Objective-C class, and (2) the class-or-ObjC-existential check is ridiculously cheap compared to the thread-safe-hash-table-over-a-dlsym-call used to find witness tables, so do the cheap, common check first. Swift SVN r18177
91 lines
2.7 KiB
Swift
91 lines
2.7 KiB
Swift
// RUN: %target-run-simple-swift | FileCheck %s
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// CHECK: testing...
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println("testing...")
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class C {}
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func bridgedStatus<T>(_: T.Type) -> String {
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let bridged = isBridgedToObjectiveC(T.self)
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let verbatim = isBridgedVerbatimToObjectiveC(T.self)
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if !bridged && verbatim {
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return "IS NOT BRIDGED BUT IS VERBATIM?!"
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}
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return bridged ?
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verbatim ? "is bridged verbatim" : "is custom-bridged"
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: "is unbridged"
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}
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func testBridging<T>(x: T, name: String) {
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println("\(name) \(bridgedStatus(T.self))")
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var b : String
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if let result: AnyObject = bridgeToObjectiveC(x) {
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b = "bridged as " + (
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(result as C) ? "C" : (result as T) ? "itself" : "an unknown type")
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}
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else {
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b = "did not bridge"
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}
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println("\(name) instance \(b)")
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}
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//===----------------------------------------------------------------------===//
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struct BridgedValueType : _BridgedToObjectiveC {
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static func getObjectiveCType() -> Any.Type {
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return C.self
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}
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func bridgeToObjectiveC() -> C {
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return C()
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}
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static func bridgeFromObjectiveC(x: C) -> BridgedValueType? {
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fatal("implement")
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}
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}
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// CHECK-NEXT: BridgedValueType is custom-bridged
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// CHECK-NEXT: BridgedValueType instance bridged as C
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testBridging(BridgedValueType(), "BridgedValueType")
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//===----------------------------------------------------------------------===//
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struct UnbridgedValueType {}
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// CHECK-NEXT: UnbridgedValueType is unbridged
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// CHECK-NEXT: UnbridgedValueType instance did not bridge
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testBridging(UnbridgedValueType(), "UnbridgedValueType")
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//===----------------------------------------------------------------------===//
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class PlainClass {}
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// CHECK-NEXT: PlainClass is bridged verbatim
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// CHECK-NEXT: PlainClass instance bridged as itself
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testBridging(PlainClass(), "PlainClass")
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//===----------------------------------------------------------------------===//
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struct ConditionallyBridged<T>
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: _BridgedToObjectiveC, _ConditionallyBridgedToObjectiveC {
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static func getObjectiveCType() -> Any.Type {
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return C.self
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}
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func bridgeToObjectiveC() -> C {
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return C()
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}
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static func bridgeFromObjectiveC(x: C) -> ConditionallyBridged<T>? {
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fatal("implement")
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}
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static func isBridgedToObjectiveC() -> Bool {
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return !((T.self as Any) as String.Type)
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}
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}
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// CHECK-NEXT: ConditionallyBridged<Int> is custom-bridged
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// CHECK-NEXT: ConditionallyBridged<Int> instance bridged as C
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testBridging(ConditionallyBridged<Int>(), "ConditionallyBridged<Int>")
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// CHECK-NEXT: ConditionallyBridged<String> is unbridged
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// CHECK-NEXT: ConditionallyBridged<String> instance did not bridge
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testBridging(
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ConditionallyBridged<String>(), "ConditionallyBridged<String>")
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// CHECK-NEXT: done.
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println("done.")
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