Thank you. Your example really clarifies what the $initialize(...)
function is supposed to do.
Do you know if there is a straightforward way to dispatch the $new(...)
method based on the signature of the arguments? I am thinking along the
lines of S4 methods with valid signatures.
Thanks again for the example.
On 10/28/2010 12:12 PM, Jon Clayden wrote:
Sorry - you don't need to assign the value of initFields(). I was
going to do it in two lines but then realised one was enough... :)
TestClass<- setRefClass ("TestClass",
fields = list (text = "character"),
methods = list (
initialize = function (text) {
initFields(text=paste(text,"\n")) },
print = function () { cat(text) } )
)
All the best,
Jon
On 28 October 2010 15:13, Daniel Lee<bear...@alum.mit.edu> wrote:
Is it possible to override the $new(...) in the reference class generator? I
have tried adding a "new" method to the methods of the class, but that is
obviously not correct. I have also tried adding it to the class generator,
but the class generator still uses the default constructor.
As a simple example, this is the current interface:
TestClass<- setRefClass ("TestClass",
fields = list (text = "character"),
methods = list (
print = function () {cat(text)})
)
test<- TestClass$new (text="Hello World")
test$print()
I would like to override $new(...) to be something like (add a "\n" to the
end of the input, no need to specify input fields):
TestClass$methods (new = function (text) {
text<- paste (text, "\n")
methods:::new (def, text=text)
})
The constructor would then be:
test<- TestClass$new ("Hello World")
This is a subtle, but useful change. I have also tried adding to TestClass a
method $newInstance(text), but that was not successful. If this is not
possible, could we consider augmenting the Reference Class interface to
include constructors?
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
