Svetlana Isakova
36 lines
643 B
Kotlin
36 lines
643 B
Kotlin
trait A {
|
|
fun foo()
|
|
}
|
|
|
|
trait B : A {
|
|
fun bar()
|
|
}
|
|
|
|
trait C
|
|
|
|
trait D : A
|
|
|
|
fun test(a: A?) {
|
|
if (a != null && a is B?) {
|
|
<info descr="Automatically cast to B">a</info>.bar()
|
|
}
|
|
|
|
if (a is B && a is C) {
|
|
<info descr="Automatically cast to B">a</info>.foo()
|
|
}
|
|
|
|
if (a is B? && a is C?) {
|
|
<info descr="Automatically cast to B?">a</info><info>?.</info>bar()
|
|
}
|
|
|
|
a<info>?.</info>foo()
|
|
if (a is B? && a is C?) {
|
|
a<info>?.</info>foo()
|
|
}
|
|
|
|
if (a is B && a is D) {
|
|
//when it's resolved, the message should be 'Automatically cast to A'
|
|
a.<error>foo</error>
|
|
}
|
|
}
|