bool EnumerateHeadRevisionPackageData ( [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< bool(const [FConcertPackageInfo](API\Plugins\ConcertSyncCore\FConcertPackageInfo) &, [FConcertPackageDataStream](API\Plugins\ConcertSyncCore\FConcertPackageDataStream) &)> InCallback ) const