Zalim Bashorov
42 lines
744 B
Kotlin
42 lines
744 B
Kotlin
package foo
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trait Getter<T> {
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fun get(): T
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}
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class Delegate<T>(val getter: Getter<T>) {
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var t: T? = null
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fun get(obj: Any, property: PropertyMetadata): T {
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if (t != null) {
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return t!!
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}
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return getter.get()
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}
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fun set(obj: Any, property: PropertyMetadata, value: T) {
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t = value
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}
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}
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class A : Getter<Int> {
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var value = 0
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override fun get(): Int {
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return value
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}
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val delegate = Delegate(this)
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val a by delegate
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var b by delegate
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}
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fun box(): String {
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val a = A()
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if (a.a != 0) return "a.a != 0"
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if (a.b != 0) return "a.b != 0"
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a.b = 4
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if (a.a != 4) return "a.a != 4"
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if (a.b != 4) return "a.b != 4"
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return "OK"
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}
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