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Add internal UNREACHABLE_CLAUSE, assertUnreachable, ifNull

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This commit is contained in:
Him188 2020-11-17 09:29:53 +08:00
parent fb82d8236d
commit 450e66ccfd
1 changed files with 21 additions and 2 deletions
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21
backend/mirai-console/src/internal/util/CommonUtils.kt
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@ -41,8 +41,27 @@ internal fun StackFrame.findLoader(): ClassLoader? {
}.getOrNull() }.getOrNull()
} }
internal inline fun <T : Any> T?.ifNull(block: () -> T): T {
contract { callsInPlace(block, InvocationKind.AT_MOST_ONCE) }
return this ?: block()
}
@PublishedApi @PublishedApi
internal inline fun assertionError(message: () -> String): Nothing { internal inline fun assertionError(message: () -> String = { "Reached an unexpected branch." }): Nothing {
contract { callsInPlace(message, InvocationKind.EXACTLY_ONCE) } contract { callsInPlace(message, InvocationKind.EXACTLY_ONCE) }
throw AssertionError(message()) throw AssertionError(message())
} }
@PublishedApi
internal inline fun assertUnreachable(message: () -> String = { "Reached an unexpected branch." }): Nothing {
contract { callsInPlace(message, InvocationKind.EXACTLY_ONCE) }
throw AssertionError(message())
}
@MarkerUnreachableClause
@PublishedApi
internal inline val UNREACHABLE_CLAUSE: Nothing
get() = assertUnreachable()
@DslMarker
private annotation class MarkerUnreachableClause