Dmitriy Novozhilov
41 lines
1.0 KiB
Kotlin
Vendored
41 lines
1.0 KiB
Kotlin
Vendored
// !WITH_NEW_INFERENCE
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package variance
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abstract class Consumer<in T> {}
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abstract class Producer<out T> {}
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abstract class Usual<T> {}
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fun foo(c: Consumer<Int>, p: Producer<Int>, u: Usual<Int>) {
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val c1: Consumer<Any> = c
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val c2: Consumer<Int> = c1
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val p1: Producer<Any> = p
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val p2: Producer<Int> = p1
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val u1: Usual<Any> = u
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val u2: Usual<Int> = u1
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}
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//Arrays copy example
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class Array<T>(val length : Int, val t : T) {
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fun get(index : Int) : T { return t }
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fun set(index : Int, value : T) { /* ... */ }
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}
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fun copy1(from : Array<Any>, to : Array<Any>) {}
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fun copy2(from : Array<out Any>, to : Array<in Any>) {}
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fun <T> copy3(from : Array<out T>, to : Array<in T>) {}
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fun copy4(from : Array<out Number>, to : Array<in Int>) {}
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fun f(ints: Array<Int>, any: Array<Any>, numbers: Array<Number>) {
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<!INAPPLICABLE_CANDIDATE!>copy1<!>(ints, any)
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copy2(ints, any) //ok
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<!INAPPLICABLE_CANDIDATE!>copy2<!>(ints, numbers)
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copy3<Int>(ints, numbers)
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copy4(ints, numbers) //ok
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} |