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ac3f047496
toString(x) => String(x) toDebugString(x) => String(reflecting: x) Printable => CustomStringConvertible DebugPrintable => CustomDebugStringConvertible Also updated comments to clarify these protocols Swift SVN r27090
67 lines
1.8 KiB
Swift
67 lines
1.8 KiB
Swift
// RUN: %target-run-simple-swift | FileCheck %s
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class C: CustomStringConvertible {
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var value: Int
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init(_ v: Int) { value = v }
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var description: String { return String(value) }
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}
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var global = [C(1), C(2)]
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println("Begin")
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println("1. global[0] == \(global[0])")
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// CHECK: Begin
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// CHECK-NEXT: 1. global[0] == 1
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func doit(inout local: C) {
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println("2. local == \(local)")
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println("2. global[0] == \(global[0])")
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// CHECK-NEXT: 2. local == 1
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// CHECK-NEXT: 2. global[0] == 1
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// There's a connection between 'local' and 'global[0]'.
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local = C(4)
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println("3. local == \(local)")
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println("3. global[0] == \(global[0])")
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// CHECK-NEXT: 3. local == 4
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// CHECK-NEXT: 3. global[0] == 4
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// This assignment is to a different index and so is
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// not allowed to cause unspecified behavior.
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global[1] = C(5)
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println("4. local == \(local)")
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println("4. global[0] == \(global[0])")
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// CHECK-NEXT: 4. local == 4
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// CHECK-NEXT: 4. global[0] == 4
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// The connection is not yet broken.
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local = C(2)
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println("5. local == \(local)")
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println("5. global[0] == \(global[0])")
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// CHECK-NEXT: 5. local == 2
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// CHECK-NEXT: 5. global[0] == 2
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// This assignment structurally changes 'global' while a
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// simultaneous modification is occuring to it. This is
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// allowed to have unspecified behavior but not to crash.
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global.append(C(3))
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println("6. local == \(local)")
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println("6. global[0] == \(global[0])")
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// CHECK-NEXT: 6. local == 2
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// CHECK-NEXT: 6. global[0] == 2
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// Note that here the connection is broken.
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local = C(7)
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println("7. local == \(local)")
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println("7. global[0] == \(global[0])")
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// CHECK-NEXT: 7. local == 7
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// CHECK-NEXT: 7. global[0] == 2
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}
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doit(&global[0])
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println("8. global[0] == \(global[0])")
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println("End")
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// CHECK-NEXT: 8. global[0] == 2
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// CHECK-NEXT: End
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