R help - Jun 2017 - [Rd] setReplaceMethod creates 'object' in the userworkspace

Hi,

I recognized that the function 'setReplaceMethod' is creating a
character vector in the user workspace having the name (e.g.
"newClass")
of the class used as value. If you can sort out a mistake by myself, I
would like you to file a bug report.

BBFN,
Jonathan

setClass("newClass", representation(value="numeric"))

setMethod(f = "initialize", signature = "newClass",
    definition = function(.Object){
        .Object at value <- 1
    return(.Object)
})

setGeneric(name = "myValue",
        def  = function(object) { standardGeneric("myValue") }
)
setGeneric(name = "myValue<-",
        def  = function(object, value) {
standardGeneric("myValue<-") }
)

setMethod("myValue", signature(object = "newClass"),
    function(object) {
        return(object at value)
    }
)

setReplaceMethod("myValue", signature = (object =
"newClass"),
    function(object, value) {
        object at value <- value
        return(object)
    }
)

myNewObject <- new("newClass")
print(object)

> print(object)
[1] "newClass"
> sessionInfo()
R version 3.4.0 (2017-04-21)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 16.04.2 LTS

Matrix products: default
BLAS: /usr/lib/atlas-base/atlas/libblas.so.3.0
LAPACK: /usr/lib/atlas-base/atlas/liblapack.so.3.0

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C             
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8   
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8  
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                
 [9] LC_ADDRESS=C               LC_TELEPHONE=C           
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C      

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base    

loaded via a namespace (and not attached):
[1] compiler_3.4.0 tools_3.4.0

>>>>> Jonathan Fritzemeier <clausjonathan.fritzemeier at
uni-duesseldorf.de>
>>>>>     on Fri, 23 Jun 2017 16:15:30 +0200 writes:
    > Hi,
    > I recognized that the function 'setReplaceMethod' is creating a
    > character vector in the user workspace having the name (e.g.
"newClass")
    > of the class used as value. If you can sort out a mistake by myself, I
    > would like you to file a bug report.

Yes, a mistake by yourself (and really not fit for R-devel,
but rather for R-help to which I follow up now)

    > BBFN,
    > Jonathan
> setClass("newClass", representation(value="numeric"))
> 
> setMethod(f = "initialize", signature = "newClass",
>     definition = function(.Object){
>         .Object at value <- 1
>     return(.Object)
> })
> 
> setGeneric(name = "myValue",
>         def  = function(object) { standardGeneric("myValue") }
> )
> setGeneric(name = "myValue<-",
>         def  = function(object, value) {
standardGeneric("myValue<-") }
> )
> 
> setMethod("myValue", signature(object = "newClass"),
>     function(object) {
>         return(object at value)
>     }
> )
> setReplaceMethod("myValue", signature = (object =
"newClass"),
>     function(object, value) {
>         object at value <- value
>         return(object)
>     }
> )
Q: what do you think happens with the above [last setReplaceMethod() call] ?
A: it creates an R object named 'object' in the globalenv
   (or the package if this would go into a package)

If just replace  '(object = "newClass")'   by  
'"newClass"'
things should be fine.

{{ Removing all the completely redundant return(.), i.e. return
   implicitly rather than via an extra function call would also
   make the code "cleaner" and more R-like  }} 

Best,
Martin

> myNewObject <- new("newClass")
> print(object)
> 
> 
> > print(object)
> [1] "newClass"
>