[EMAIL PROTECTED] wrote:
>> callGeneric is an advanced topic.
>
> Ok, when I will be older :-)
>
>>> *************************
>>> This works :
>>>
>>> setMethod("initialize","B",
>>> function(.Object,..., yValue){
>>> callNextMethod(.Object, ..., y=yValue)
>>> return(.Object)
>>> })
>>> new("B",yValue=3)
>>>
>>> but this does not :
>>>
>>> setMethod("initialize","B",
>>> function(.Object, yValue){
>>> callNextMethod(.Object, y=yValue)
>>> return(.Object)
>>> })
>>> new("B",yValue=3)
>>>
>>> Why ?
>>> Is there any help page about ... ?
>>
>> Both 'work' in the sense that an object is returned
>
> Well yes, but the second one does return an object without assigning the
> value 3, that is not realy working...
I wasn't paying enough attention to your code. callNextMethod is like
any R function -- it will not change .Object 'in place', but makes a
copy, modifies the copy, and returns the copy. So either
setMethod("initialize","B",
function(.Object,..., yValue){
.Object <- callNextMethod(.Object, ..., y=yValue)
return(.Object)
})
or more compactly
setMethod("initialize","B",
function(.Object,..., yValue){
callNextMethod(.Object, ..., y=yValue)
})
The code example is incomplete, so I don't really know why one version
assigned y=3 for you and the other did not; for me, neither version did
the assignment.
Martin
>> In an object-oriented sense, initialize,B-method should really just
>> deal with it's own slots; it shouldn't have to 'know' about either
>> classes that it extends (A) or classes that extend it. And it
>> shouldn't do work that inherited methods (i.e., initialize,ANY-method)
>> do.
>
> I get your point and I agree : I am developing B, you are developing A,
> I do not want to know what is in A so B should not initialize its 'A part'
>
> On the other hand, I do not like the "..." . "..." can be anything,
> there is no controle at all, no type checking.
> I would prefers to initialize B giving its value for its own slot AND an
> object class A. So I send you the value for A, you send me an objets
> 'aaa' of class A then I initialize B with some value and aaa. This way,
> B keep its role but does not transmit anythink to A without controling it.
>
> Best,
>
> Christophe
>
> ----------------------------------------------------------------
> Ce message a ete envoye par IMP, grace a l'Universite Paris 10 Nanterre
>
>
>
--
Martin Morgan
Computational Biology / Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N.
PO Box 19024 Seattle, WA 98109
Location: Arnold Building M2 B169
Phone: (206) 667-2793
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