reference-class

I'm aware that this would be a terribly unreliable hack. But out of pure interest: What would you need to manually change in the .refClassDef field of an ref class object if the Reference Class definition of an already instantiated object changed and you would like it to "be informed about the update" (without re-instantiating it). After all, it does seem to work if additional methods are introduced, but not for modifications of existing methods (see example below). This question is related to my answer in this post . Example Original class def: MyReferenceClass <- setRefClass(

Actual questions Shouldn't the fact that R6 classes inherit from (informal S3) class R6 allow the definition of S4 methods for signature arguments of that very class? As this is - AFAICT - not the case, what would be a workaround that is in line with current S3/S4 standards or that could somewhat be regarded as "best practice" in such situations? Background and example Reference Classes Consider the following example where you would like to define methods that dispatch on the superclass that all instances of Reference Classes inherit from ( envRefClass ): TestRefClass <- setRefClass(

The code and the warnings: tinyclass <- setRefClass("TinyClass", methods = list(doNothing=function(){})) tc <- tinyclass() tc$doNothing() NULL Warning messages: 1: In installClassMethod(value, self, field, selfEnv, thisClass) : method .objectPackage from class TinyClass was not processed into a class method until being installed. Possible corruption of the methods in the class. 2: In installClassMethod(value, self, field, selfEnv, thisClass) : method .objectParent from class TinyClass was not processed into a class method until being installed. Possible corruption of the methods in the class.

I am trying to create a simple reference class in R. Here is my code (R beginner): MyClass <- setRefClass("MyClass", fields = list(a = "numeric", b = "numeric"), methods = list( initialize <- function(){ print("Initializing") a <<- 1 b <<- 2 }, printValues <- function(){ print(a) print(b) } ) ) a <- MyClass$new() a$printValues() This produces the following error for the last line, a$printValues: Error in envRefInferField(x, what, getClass(class(x)), selfEnv) : "printValues" is not a valid field or method name for reference class “MyClass” Also, the initializer method is not being called ? Can

I've noticed some strange behaviour in R reference classes when trying to implement some optimisation algorithm. There seems to be some behind-the-scenes parsing magic involved in initialising methods in a particular which makes it difficult to work with anonymous functions. Here's an example that illustrates the difficulty: I define a function to optimise (f_opt), a function that runs optim on it, and a reference class that has these two as methods. The odd behaviour will be clearer in the code f_opt <- function(x) (t(x)%*%x) do_optim_opt <- function(x) optim(x,f) do_optim2_opt <- function(x)

Is it possible to have private member fields inside of an R reference class. Playing with some of the online examples I have: > Account <- setRefClass( "ref_Account" > , fields = list( > number = "character" > , balance ="numeric") > , methods = list( > deposit <- function(amount) { > if(amount < 0) { > stop("deposits must be positive") > } > balance <<- balance + amount > } > , withdraw <- function(amount) { > if(amount < 0) { > stop("withdrawls must be positive") > } > balance <<- balance - amount > } > ) ) > > > tb <- Account$new(balance=50.75, number="baml-029873") tb$balance > tb$balance

I would like to pass a reference class to a reference class constructor, and assign the passed reference class as a field. However, when I run the code below, I don't understand why I get an error. My questions are: 1) Please can someone kindly explain why this error is occurring: > a <- ClassA&new() Error in .getClassFromCache(Class, where) : argument "Class" is missing, with no default > b <- ClassB$new(a) Error in .Object$initialize(...) : object 'a' not found 2) I have declared class.a.container as class "list", however I want this to be a reference class. What do I need to put here