NOTE: This site is deprecated. The site will be turned down after January 31, 2023, and traffic will redirect to the new site at In the meantime, updates will be made only to


Stay organized with collections Save and categorize content based on your preferences.


operator fun <M : GeneratedMessageV3.ExtendableMessage<M>, MorBT : GeneratedMessageV3.ExtendableMessageOrBuilder<M>> MorBT.contains(extension: ExtensionLite<M, *>): Boolean
More info

Returns true if the specified extension is set on this builder.