There is also an item in the NEWS file:
Field assignments in reference classes are now consistent with
slots in S4 classes: the assigned value must come from the declared
class (if any) for the field or from a subclass.
On 8/5/11 7:24 AM, Simon Urbanek wrote:
It's worth actually reading the list you post to ...
http://r.789695.n4.nabble.com/Reference-classes-assignments-to-fields-td3708168.html
On Aug 5, 2011, at 6:41 AM, Jon Clayden wrote:
Dear all,
I've just had a package update bounced from CRAN because of a recent
change in R-devel which seems to affect the behaviour of the
initFields() reference class method. (The change must be very recent
because I tested the package on a week-old build of R-devel.) It seems
that the method no longer coerces its arguments to the expected type
of each field. For a simple example:
Foo<- setRefClass("Foo", fields=list(number="integer"),
methods=list(initialize=function (number = NULL) initFields(number=number)))
Foo$new()
Error in function (value) :
invalid replacement for field ‘number’, should be from class
“integer” or a subclass (was class “NULL”)
(This used to work, with "number" being set to "integer(0)"). In fact
it is now extremely strict, not even allowing a double literal which
is equal to an integer:
Foo$new(number=1)
Error in function (value) :
invalid replacement for field ‘number’, should be from class
“integer” or a subclass (was class “numeric”)
I don't see anything about this in the NEWS, so I was wondering if I
could get clarification on whether this is now the intended behaviour,
before I further modify the package. I must say that this will be a
bit of a pain to "correct"...
All the best,
Jon
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