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// RUN: %target-run-simple-swift | %FileCheck %s
// REQUIRES: executable_test
protocol Protocol : class {
func noop()
}
//========================== Test pure Swift classes ==========================
class SwiftClassBase : Protocol {
func noop() { print("noop") }
}
class SwiftClass : SwiftClassBase {
override init() {
print("SwiftClass Created")
}
deinit {
print("SwiftClass Destroyed")
}
}
func printState(_ x : SwiftClassBase?) {
print((x != nil) ? "is present" : "is nil")
}
func testSwiftClass() {
print("testSwiftClass") // CHECK: testSwiftClass
unowned var w : SwiftClassBase?
printState(w) // CHECK-NEXT: is nil
var c : SwiftClassBase = SwiftClass() // CHECK: SwiftClass Created
printState(w) // CHECK-NEXT: is nil
w = c
printState(w) // CHECK-NEXT: is present
c.noop() // CHECK-NEXT: noop
c = SwiftClassBase() // CHECK-NEXT: SwiftClass Destroyed
}
testSwiftClass()
func testSwiftImplicitOptionalClass() {
print("testSwiftImplicitOptionalClass") // CHECK: testSwiftImplicitOptionalClass
unowned var w : SwiftClassBase!
printState(w) // CHECK-NEXT: is nil
var c : SwiftClassBase = SwiftClass() // CHECK: SwiftClass Created
printState(w) // CHECK-NEXT: is nil
w = c
printState(w) // CHECK-NEXT: is present
c.noop() // CHECK-NEXT: noop
c = SwiftClassBase() // CHECK-NEXT: SwiftClass Destroyed
}
testSwiftImplicitOptionalClass()
func testWeakInLet() {
print("testWeakInLet") // CHECK-LABEL: testWeakInLet
struct WeakBox {
unowned var value: SwiftClassBase?
}
var obj: SwiftClassBase? = SwiftClass() // CHECK: SwiftClass Created
let box = WeakBox(value: obj)
printState(box.value) // CHECK-NEXT: is present
obj = nil // CHECK-NEXT: SwiftClass Destroyed
}
testWeakInLet()
//======================== Test Classbound Protocols ========================
func printState(_ x : Protocol?) {
print((x != nil) ? "is present" : "is nil")
}
func testProtocol() {
print("testProtocol") // CHECK: testProtocol
unowned var w : Protocol?
printState(w) // CHECK-NEXT: is nil
var c : SwiftClassBase = SwiftClass() // CHECK: SwiftClass Created
printState(w) // CHECK-NEXT: is nil
w = c
printState(w) // CHECK-NEXT: is present
c.noop() // CHECK-NEXT: noop
c = SwiftClassBase() // CHECK-NEXT: SwiftClass Destroyed
}
testProtocol()
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