[Rd] Define replacement functions

[soeren.vogel at posteo.ch]

No. I fixed that, the NAMESPACE file now contains:

S3method("[[<-", mylist)
S3method("$<-", mylist)

It still does not work. I also created a print method (print.mylist) which did work out of the box, regardless of being in the NAMESPACE file or not. Could it be somehow in here (also in my NAMESPACE file):

exportPattern("^[[:alpha:]]+")

Or could it be that the type of quoting causes the problems? Like in the NAMESPACE I used double quotes for function definition. Do I need single quotes or back-ticks?

Or is there a package where I can look how others implemented this kind of functionality?

Sören

> On 04.05.2015, at 16:17, Hadley Wickham <h.wickham at gmail.com> wrote:
> 
> Did you export the S3 methods in the NAMESPACE?
> 
> Hadley
> 
> On Mon, May 4, 2015 at 7:52 AM,  <soeren.vogel at posteo.ch> wrote:
>> Hello
>> 
>> I tried to define replacement functions for the class "mylist". When I test them in an active R session, they work -- however, when I put them into a package, they don't. Why and how to fix?
>> 
>> 
>> make_my_list <- function( x, y ) {
>>        return(structure(list(x, y, class="mylist")))
>> }
>> mylist <- make_my_list(1:4, letters[3:7])
>> mylist
>> mylist[['x']] <- 4:6
>> mylist
>> "[[<-" <- function(x, field, value) {
>>        UseMethod('[[<-', x)
>> }
>> "[[<-.mylist" <- function(x, field, value) {
>>        stop( "Do not assign." )
>> }
>> mylist[['x']] <- 1:10
>> mylist
>> mylist$y <- LETTERS[1:3]
>> mylist
>> "$<-" <- function(x, field, value) {
>>        UseMethod('$<-', x)
>> }
>> "$<-.mylist" <- function(x, field, value) {
>>        stop( "Do not assign." )
>> }
>> mylist$y <- LETTERS[10:15]
>> 
>> 
>> Thanks for help
>> Sören
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>> R-devel at r-project.org mailing list
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> 
> 
> 
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