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Add warning for ifNull on non-null value

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Him188 2020-11-17 09:40:34 +08:00
parent 136b0c11d8
commit 453d072cc7
1 changed files with 7 additions and 0 deletions
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7
backend/mirai-console/src/internal/util/CommonUtils.kt
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@ -41,11 +41,18 @@ internal fun StackFrame.findLoader(): ClassLoader? {
}.getOrNull()
}
@Suppress("INVISIBLE_REFERENCE", "INVISIBLE_MEMBER")
@kotlin.internal.LowPriorityInOverloadResolution
internal inline fun <T : Any> T?.ifNull(block: () -> T): T {
contract { callsInPlace(block, InvocationKind.AT_MOST_ONCE) }
return this ?: block()
}
@Suppress("DeprecatedCallableAddReplaceWith")
@Deprecated("Useless ifNull on not null value.")
@JvmName("ifNull1")
internal inline fun <T : Any> T.ifNull(block: () -> T): T = this
@PublishedApi
internal inline fun assertionError(message: () -> String = { "Reached an unexpected branch." }): Nothing {
contract { callsInPlace(message, InvocationKind.EXACTLY_ONCE) }