Ivan Kylchik
74 lines
2.9 KiB
Kotlin
Vendored
74 lines
2.9 KiB
Kotlin
Vendored
import kotlin.*
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import kotlin.collections.*
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@CompileTimeCalculation
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fun classCastWithException(a: Any): String {
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return try {
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a as Int
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"Given value is $a and its doubled value is ${2 * a}"
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} catch (e: ClassCastException) {
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"Given value isnt't Int; Exception message: \"${e.message}\""
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}
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}
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@CompileTimeCalculation
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fun safeClassCast(a: Any): Int {
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return (a as? String)?.length ?: -1
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}
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@CompileTimeCalculation
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fun <T> unsafeClassCast(): T {
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return 1 as T
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}
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@CompileTimeCalculation
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fun <T> getIntList() = listOf<Int>(1, 2) as T
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@CompileTimeCalculation
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fun <T> getStringNullableList() = listOf<String?>(null, "1") as T
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@CompileTimeCalculation
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fun getLength(str: String) = str.length
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@CompileTimeCalculation
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class A<T>() {
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fun unsafeCast(): T {
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return 1 as T
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}
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}
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const val a1 = <!EVALUATED: `Given value is 10 and its doubled value is 20`!>classCastWithException(10)<!>
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const val a2 = <!EVALUATED: `Given value isnt't Int; Exception message: "kotlin.String cannot be cast to kotlin.Int"`!>classCastWithException("10")<!>
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const val b1 = <!EVALUATED: `-1`!>safeClassCast(10)<!>
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const val b2 = <!EVALUATED: `2`!>safeClassCast("10")<!>
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// in this example all unsafe cast will be "successful", but will fall when trying to assign
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const val c1 = <!EVALUATED: `1`!>unsafeClassCast<Int>()<!>
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const val c2 = <!WAS_NOT_EVALUATED: `
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Exception java.lang.ClassCastException: kotlin.Int cannot be cast to kotlin.String
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at ClassCastExceptionKt.<clinit>(classCastException.kt:48)`!>unsafeClassCast<String>()<!>
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const val d1 = A<Int>().<!EVALUATED: `1`!>unsafeCast()<!>
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const val d2 = A<String>().<!WAS_NOT_EVALUATED: `
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Exception java.lang.ClassCastException: kotlin.Int cannot be cast to kotlin.String
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at ClassCastExceptionKt.<clinit>(classCastException.kt:51)`!>unsafeCast()<!>
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const val stringList = getIntList<List<String>>().<!WAS_NOT_EVALUATED: `
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Exception java.lang.ClassCastException: kotlin.Int cannot be cast to kotlin.String
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at ClassCastExceptionKt.stringList.<anonymous>(classCastException.kt:54)
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at ClassCastExceptionKt.stringList.Function$0.invoke(classCastException.kt:0)
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at StandardKt.kotlin.let(Standard.kt:32)
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at ClassCastExceptionKt.<clinit>(classCastException.kt:53)`!>let {
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it[0].length
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}<!>
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const val nullableStringList = getStringNullableList<List<String>>().<!WAS_NOT_EVALUATED: `
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Exception java.lang.NullPointerException
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at ClassCastExceptionKt.nullableStringList.<anonymous>(classCastException.kt)
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at ClassCastExceptionKt.nullableStringList.Function$0.invoke(classCastException.kt:0)
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at StandardKt.kotlin.let(Standard.kt:32)
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at ClassCastExceptionKt.<clinit>(classCastException.kt:56)`!>let { it[0].length }<!>
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const val nullableStringLength = <!WAS_NOT_EVALUATED: `
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Exception java.lang.IllegalArgumentException: Parameter specified as non-null is null: method ClassCastExceptionKt.getLength, parameter str
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at ClassCastExceptionKt.<clinit>(classCastException.kt:31)`!>getLength(getStringNullableList<List<String>>()[0])<!>
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