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109 lines
3.3 KiB
Swift
109 lines
3.3 KiB
Swift
// RUN: %target-typecheck-verify-swift
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// REQUIRES: objc_interop
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// FIXME: Should go into the standard library.
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public extension _ObjectiveCBridgeable {
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static func _unconditionallyBridgeFromObjectiveC(_ source: _ObjectiveCType?)
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-> Self {
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var result: Self?
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_forceBridgeFromObjectiveC(source!, result: &result)
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return result!
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}
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}
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class Root : Hashable {
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func hash(into hasher: inout Hasher) {}
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}
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func ==(x: Root, y: Root) -> Bool { return true }
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class ObjC : Root {
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var x = 0
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}
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class DerivesObjC : ObjC { }
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class Unrelated : Root { }
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struct BridgedToObjC : Hashable, _ObjectiveCBridgeable {
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func _bridgeToObjectiveC() -> ObjC {
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return ObjC()
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}
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static func _forceBridgeFromObjectiveC(
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_ x: ObjC,
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result: inout BridgedToObjC?
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) {
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}
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static func _conditionallyBridgeFromObjectiveC(
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_ x: ObjC,
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result: inout BridgedToObjC?
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) -> Bool {
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return true
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}
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func hash(into hasher: inout Hasher) {}
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}
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func ==(x: BridgedToObjC, y: BridgedToObjC) -> Bool { return true }
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func testUpcastBridge() {
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var setR = Set<Root>()
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var setO = Set<ObjC>()
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var setD = Set<DerivesObjC>()
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var setB = Set<BridgedToObjC>()
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// Upcast to object types.
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setR = setB as Set<Root>; _ = setR
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setO = setB as Set<ObjC>; _ = setO
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// Upcast object to bridged type
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setB = setO // expected-error{{cannot assign value of type 'Set<ObjC>' to type 'Set<BridgedToObjC>'}}
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// expected-note@-1 {{arguments to generic parameter 'Element' ('ObjC' and 'BridgedToObjC') are expected to be equal}}
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// Failed upcast
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setD = setB // expected-error{{cannot assign value of type 'Set<BridgedToObjC>' to type 'Set<DerivesObjC>'}}
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// expected-note@-1 {{arguments to generic parameter 'Element' ('BridgedToObjC' and 'DerivesObjC') are expected to be equal}}
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}
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func testForcedDowncastBridge() {
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let setR = Set<Root>()
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let setO = Set<ObjC>()
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let setD = Set<DerivesObjC>()
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let setB = Set<BridgedToObjC>()
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_ = setR as! Set<BridgedToObjC>
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_ = setO as Set<BridgedToObjC>
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_ = setD as! Set<BridgedToObjC> // expected-warning{{forced cast from 'Set<DerivesObjC>' to 'Set<BridgedToObjC>' always succeeds; did you mean to use 'as'?}}
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_ = setB as! Set<Root> // expected-warning{{forced cast from 'Set<BridgedToObjC>' to 'Set<Root>' always succeeds; did you mean to use 'as'?}}
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_ = setB as! Set<ObjC> // expected-warning{{forced cast from 'Set<BridgedToObjC>' to 'Set<ObjC>' always succeeds; did you mean to use 'as'?}}
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_ = setB as! Set<DerivesObjC>
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}
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func testConditionalDowncastBridge() {
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let setR = Set<Root>()
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let setO = Set<ObjC>()
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let setD = Set<DerivesObjC>()
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let setB = Set<BridgedToObjC>()
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if let s = setR as? Set<BridgedToObjC> { _ = s }
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let s1 = setO as Set<BridgedToObjC>
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if let s = setD as? Set<BridgedToObjC> { _ = s } // expected-warning {{conditional cast from 'Set<DerivesObjC>' to 'Set<BridgedToObjC>' always succeeds}}
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if let s = setB as? Set<Root> { _ = s } // expected-warning{{conditional cast from 'Set<BridgedToObjC>' to 'Set<Root>' always succeeds}}
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if let s = setB as? Set<ObjC> { _ = s } // expected-warning{{conditional cast from 'Set<BridgedToObjC>' to 'Set<ObjC>' always succeeds}}
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if let s = setB as? Set<DerivesObjC> { _ = s }
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if let s = setB as? Set<Unrelated> { _ = s } // OK
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_ = setR
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_ = setO
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_ = setD
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_ = setB
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_ = s1
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}
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