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Add contracts to cast, safeCast and castOrNull; Add uncheckedCast

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Him188 2021-06-25 22:08:49 +08:00
parent f90320bd2b
commit dad2d965ab
1 changed files with 17 additions and 3 deletions
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20
mirai-core-utils/src/commonMain/kotlin/StandardUtils.kt
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@ -13,13 +13,27 @@
package net.mamoe.mirai.utils
import java.util.*
import kotlin.contracts.contract
import kotlin.reflect.KClass
public inline fun <reified T> Any?.cast(): T = this as T
public inline fun <reified T> Any?.cast(): T {
contract { returns() implies (this@cast is T) }
return this as T
}
public inline fun <reified T> Any?.safeCast(): T? = this as? T
public inline fun <reified T> Any?.safeCast(): T? {
contract { returnsNotNull() implies (this@safeCast is T) }
return this as? T
}
public inline fun <reified T> Any?.castOrNull(): T? {
contract { returnsNotNull() implies (this@castOrNull is T) }
return this as? T
}
@Suppress("NOTHING_TO_INLINE", "UNCHECKED_CAST")
public inline fun <T> Any?.uncheckedCast(): T = this as T
public inline fun <reified T> Any?.castOrNull(): T? = this as? T
public inline fun <reified R> Iterable<*>.firstIsInstanceOrNull(): R? {
for (it in this) {