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Polymorphic copy: Difference between revisions
added swift
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Line 1,409:
obj1 printName.
obj2 printName.</lang>
=={{header|Swift}}==
<lang swift>class T {
@required init() { } // constructor used in polymorphic initialization must be @required
func identify() {
println("I am a genuine T")
}
func copy() -> T {
let newObj : T = self.dynamicType() // call an appropriate constructor here
// then copy data into newObj as appropriate here
// make sure to use "self.dynamicType(...)" and
// not "T(...)" to make it polymorphic
return newObj
}
}
class S : T {
init() { } // must implement the constructor here too since it is @required in T
override func identify() {
println("I am an S")
}
}
let original : T = S()
let another : T = original.copy()
println(original === another) // prints "false" (i.e. they are different objects)
another.identify() // prints "I am an S"</lang>
=={{header|Tcl}}==
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