[Rd] Private Variables in R5-Classes possible?

From: Claus Jonathan Fritzemeier <ClausJonathan.Fritzemeier_at_uni-duesseldorf.de>
Date: Tue, 21 Feb 2012 12:07:24 +0100

Hi list,

is there a way to define some kind of private Variable?

I would like to prevent the user from manipulating fields on his own, in order to not destroy data structures.

The problem is, that as soon as the variable exists in the environment it is accessible via t$secret_value.

test <- setRefClass("test", fields=list( secret = function(value){
cat("the function was called\n")
if(exists("secret_value", envir=.self@.xData)){ return(get("secret_value", envir=.self@.xData, inherits = F)) }
assign("secret_value", value=value, , envir=.self@.xData) }
) )

> t <- test$new()
> t$secret

the function was called

> t$secret_value

Error in envRefInferField(x, what, getClass(class(x)), selfEnv) : "secret_value" is not a valid field or method name for reference class “test”
> t$secret <- "Blub"

the function was called
> t$secret_value

[1] "Blub"

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https://stat.ethz.ch/mailman/listinfo/r-devel Received on Tue 21 Feb 2012 - 13:30:31 GMT

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