OptIn(vararg markerClass: KClass<out Annotation>)
Allows to use the API denoted by the given markers in the annotated file, declaration, or expression. If a declaration is annotated with OptIn, its usages are not required to opt in to that API.
This class requires opt-in itself and can only be used with the compiler argument
© 2010–2020 JetBrains s.r.o. and Kotlin Programming Language contributors
Licensed under the Apache License, Version 2.0.