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03a6190a1f
Previously the "as" keyword could either represent coercion or or forced downcasting. This change separates the two notions. "as" now only means type conversion, while the new "as!" operator is used to perform forced downcasting. If a program uses "as" where "as!" is called for, we emit a diagnostic and fixit. Internally, this change removes the UnresolvedCheckedCastExpr class, in favor of directly instantiating CoerceExpr when parsing the "as" operator, and ForcedCheckedCastExpr when parsing the "as!" operator. Swift SVN r24253
85 lines
1.9 KiB
Swift
85 lines
1.9 KiB
Swift
// RUN: %target-run-simple-swift | FileCheck %s
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import CoreFoundation
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import Foundation
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class SwiftClass { }
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func genericCast<T>(x: AnyObject, _: T.Type) -> T? {
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return x as? T
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}
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func genericCastUnconditional<T>(x: AnyObject, _: T.Type) -> T {
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return x as! T
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}
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// Check _cfTypeID() on a Swift class
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let nsObject = NSObject()
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let swiftObject = SwiftClass()
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assert(CFGetTypeID(nsObject) == CFGetTypeID(swiftObject))
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// Check CFString <-> AnyObject
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func testCFStringAnyObject() {
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// Create a CFString
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let cfStr: CFString
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= CFStringCreateWithCString(nil, "Swift", CFStringBuiltInEncodings.ASCII.rawValue)
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// CHECK: Swift
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println(cfStr)
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// Convert it to AnyObject
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let anyObject: AnyObject = cfStr
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// CHECK: Swift
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println(anyObject)
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// Convert it back to a CFString
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let cfStr2 = anyObject as! CFString
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// CHECK: Swift
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println(cfStr2)
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// Conditional cast through a generic to a CFString
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if let cfStr3 = genericCast(anyObject, CFString.self) {
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// CHECK: Swift
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println(cfStr3)
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} else {
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println("Conditional cast failed")
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}
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// Forced cast through a generic to a CFString
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let cfStr4 = genericCastUnconditional(anyObject, CFString.self)
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// CHECK: Swift
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println(cfStr4)
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// CHECK: done
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println("done")
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}
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testCFStringAnyObject()
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// Check CFString.Type <-> AnyObject.Type
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func testCFStringAnyObjectType() {
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let cfStr: CFString
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= CFStringCreateWithCString(nil, "Swift", CFStringBuiltInEncodings.ASCII.rawValue)
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let cfStrType = cfStr.dynamicType
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// CHECK: [[STRING_CLASS:(NS|CF).*String]]
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println(cfStrType)
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// Convert to AnyObject.Type
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let anyObjectType: AnyObject.Type = cfStrType
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// CHECK: [[STRING_CLASS]]
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println(anyObjectType)
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// Convert back to CFString.Type
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let cfStrType2 = anyObjectType as! CFString.Type
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// CHECK: [[STRING_CLASS]]
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println(cfStrType2)
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// CHECK: done
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println("done")
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}
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testCFStringAnyObjectType()
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