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ExtensionFunctions2.kt
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ExtensionFunctions2.kt
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open class Bases { }
class Deriveds : Base() { }
open class BaseCaller {
open fun Base.printFunctionInfo() {
println("Base extension function in BaseCaller")
}
open fun Derived.printFunctionInfo() {
println("Derived extension function in BaseCaller")
}
fun call(b: Base) {
b.printFunctionInfo() // call the extension function
}
}
class DerivedCaller: BaseCaller() {
override fun Base.printFunctionInfo() {
println("Base extension function in DerivedCaller")
}
override fun Derived.printFunctionInfo() {
println("Derived extension function in DerivedCaller")
}
}
fun main() {
// BaseCaller means extension function from BaseCaller is chosen, since call function declares it as type
// Base it will chose extension function for Base Class - Base class extension function from BaseCaller
BaseCaller().call(Base()) // "Base extension function in BaseCaller"
// DerivedCaller means extension function from DerivedCaller is chosen, since call function declares it as type
// Base it will chose extension function for Base Class - Base class extension function from DerivedCaller
DerivedCaller().call(Base()) // "Base extension function in DerivedCaller" - dispatch receiver is resolved virtually
// DerivedCaller means extension function from DerivedCaller is chosen, since call function declares it as type
// Base it will chose extension function for Base Class - Base class extension function from DerivedCaller
DerivedCaller().call(Derived()) // "Base extension function in DerivedCaller" - extension receiver is resolved statically
}