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3fded63cac
Mock up a naive Printable protocol, and do some dirty tricks in the runtime to implement a 'printAny' function that uses swift_conformsToProtocol to look up a conformance to Printable if the type has one, or falls back to a dumb opaque printing if it doesn't. Use this to make Array<T> Printable in some way or another for all T. Swift SVN r13902
29 lines
555 B
Swift
29 lines
555 B
Swift
// RUN: %target-run-simple-swift | FileCheck %s
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// CHECK: [1, 2, 3]
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[1, 2, 3].printSelf()
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println()
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// CHECK: [foo, bar, bas]
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["foo", "bar", "bas"].printSelf()
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println()
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struct Unprintable {
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val x: Int
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}
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// CHECK: [<something>, <something>, <something>]
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[Unprintable(1), Unprintable(2), Unprintable(3)].printSelf()
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println()
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struct CanBePrinted : Printable {
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val x: Int
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func printSelf() {
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print("►\(x)◀︎")
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}
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}
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// CHECK: [►1◀︎, ►2◀︎, ►3◀︎]
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[CanBePrinted(1), CanBePrinted(2), CanBePrinted(3)].printSelf()
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println()
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