Pavel V. Talanov
47 lines
1.1 KiB
Kotlin
47 lines
1.1 KiB
Kotlin
import java.util.IdentityHashMap
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class A {
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var foo: Int by IntHandler
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companion object {
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var bar: Any? by AnyHandler
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}
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}
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val baz: String by StringHandler
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val metadatas = IdentityHashMap<PropertyMetadata, Unit>()
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fun record(p: PropertyMetadata) = metadatas.put(p, Unit)
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object IntHandler {
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fun get(t: Any?, p: PropertyMetadata): Int { record(p); return 42 }
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fun set(t: Any?, p: PropertyMetadata, value: Int) { record(p) }
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}
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object AnyHandler {
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fun get(t: Any?, p: PropertyMetadata): Any? { record(p); return 3.14 }
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fun set(t: Any?, p: PropertyMetadata, value: Any?) { record(p) }
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}
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object StringHandler {
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fun get(t: Any?, p: PropertyMetadata): String { record(p); return p.name }
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fun set(t: Any?, p: PropertyMetadata, value: String) { record(p) }
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}
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fun box(): String {
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val a = A()
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a.foo = 42
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a.foo = a.foo + baz.length()
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a.foo = 239
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A.bar = baz + a.foo
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baz + A.bar
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if (metadatas.keySet().size() != 3)
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return "Fail: only three instances of PropertyMetadata should have been created\n${metadatas.keySet()}"
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return "OK"
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}
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