Ilmir Usmanov
48 lines
1.1 KiB
Kotlin
Vendored
48 lines
1.1 KiB
Kotlin
Vendored
// WITH_RUNTIME
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class Foo {
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var a: Int = 42
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var d by DelegateFactory(0)
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}
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var provideDelegateInvoked = 0
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var setterInvoked = 0
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@Suppress("OPTIONAL_DECLARATION_USAGE_IN_NON_COMMON_SOURCE")
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@kotlin.jvm.JvmInline
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value class DelegateFactory(val default: Int) {
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operator fun provideDelegate(thisRef: Any?, prop: Any?): Delegate {
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provideDelegateInvoked++
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return Delegate(default)
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}
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}
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@Suppress("OPTIONAL_DECLARATION_USAGE_IN_NON_COMMON_SOURCE")
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@kotlin.jvm.JvmInline
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value class Delegate(val default: Int) {
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operator fun getValue(thisRef: Any?, prop: Any?) =
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(thisRef as? Foo)?.a ?: default
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operator fun setValue(thisRef: Any?, prop: Any?, newValue: Int) {
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setterInvoked++
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if (thisRef is Foo) {
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thisRef.a = newValue
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}
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}
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}
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fun box(): String {
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val x = Foo()
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if (x.d != 42) throw AssertionError()
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x.d = 1234
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if (x.d != 1234) throw AssertionError()
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if (x.a != 1234) throw AssertionError()
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if (setterInvoked != 1) throw AssertionError()
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if (provideDelegateInvoked != 1) throw AssertionError()
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return "OK"
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} |