> >
> > Here is an example. Note that $ does not evaluate y so you have
> >to do it yourself:
> >
> >x <- structure(3, class = "myclass")
> >y <- 5
> >foo <- function(x,y) x+y
> >"$.myclass" <- function(x, i) { i <- eval.parent(parse(text=i)); foo(x,
> i)
> >}
> >x$y # structure(8, class = "myclass")
>
If I got it right, in the above example you provided '$' is defined as a method for a S3 class. How is it possible to do the same with a S4 class. If this is not possible, what is the best way to define the '$' operator whose first arguments is a S4 object and doesn't overwrite the global definition?
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