Hi Glenn,
that is actually as easy as defining a generic and defining a method for
each class to extract the slot. I do this literally in every package I
write.
setGeneric('duration', function(x, ...) standardGeneric('duration')
setMethod('duration', signature = 'MBSCashFlow', function(x) { x@Duration})
setMethod('duration', signature = 'REMICCashFlow', function(x) {x@Duration})
etc...
I suggest you take a close look at Hadley Wickham's books 'Advanced R' and
'R packages', both freely available online.
This is the relevant section of the first book :
http://adv-r.had.co.nz/OO-essentials.html
This is the other book : http://r-pkgs.had.co.nz/
Cheers
Joris
On Thu, Mar 10, 2016 at 3:05 PM, Glenn Schultz <glennmschu...@me.com> wrote:
> All,
>
> I have a package with to S4 classes (MBSCashFlow, REMICCashFlow and
> BondCashFlow) all of which contain the slot Duration. I would like have an
> accessor Duration that would work on multiple signatures. Is this
> possible? I have checked my books, help, BioConductor tutorials and it
> appears that this is not possible. Has anyone ever run into this situation?
>
> Best Glenn
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>
--
Joris Meys
Statistical consultant
Ghent University
Faculty of Bioscience Engineering
Department of Mathematical Modelling, Statistics and Bio-Informatics
tel : +32 9 264 59 87
joris.m...@ugent.be
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