If you use a private finalizer in an R package, you should set your R6 version dependency to R6 (>= 2.4.0). Private is preferable because there’s no reason a finalizer needs to be publicly accessible. As of version 2.4.0, it can be public or private. NOTE: In R6 version 2.3.0 (released ) and below, the finalize method could only be public. It does this by overriding the add() method – it increments a counter and then calls the superclass’s add() method, with super$add(x):Ī "Finalizer has been called!" #> used (Mb) gc trigger (Mb) max used (Mb) #> Ncells 711387 38.0 1413788 75.6 1413788 75.6 #> Vcells 1321954 10.1 8388608 64.0 3300781 25.2 The CountingQueue (example below) keeps a count of the total number of objects that have ever been added to the queue. Superclass methods can be called with super$xx(). HistoryQueue Next item is at index 1 #> 1: 5 #> 2: 6 #> 3: foo hq $ remove ( ) #> 5 hq $ show ( ) #> Next item is at index 2 #> 1: 5 #> 2: 6 #> 3: foo hq $ remove ( ) #> 6 # Note that this isn't very efficient - it's just for illustrating inheritance. However, the R5 branch was shelved after a little development, and it was never released. The name R5 was also a code-name used for a different object system started by Simon Urbanek, meant to solve some issues with S4 relating to syntax and performance. Although reference classes are not actually called R5, the name of this package and its classes takes inspiration from that name. Why the name R6? When R’s reference classes were introduced, some users, following the names of R’s existing class systems S3 and S4, called the new class system R5 in jest. inheritance (superclasses) which works across packages.Unlike many objects in R, instances (objects) of R6 classes have reference semantics. For more information about speed and memory footprint, see the Performance article. R6 classes are similar to R’s reference classes, but are lighter weight, and avoid some issues that come along with using S4 (R’s reference classes are based on S4).
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