You might find http://adv-r.hadley.nz/s3.html to be helpful (in
particular, http://adv-r.hadley.nz/s3.html#constructors-1, gives my
advice about subclass constructors)
On Mon, Aug 7, 2017 at 7:06 PM, Kym Nitschke <kym.nitsc...@icloud.com> wrote:
> Hi R Users,
> I am relatively new to programming in R … so I apologise if my questions
> appear ‘dumb’.
> I am using a package that defines a number of S3 classes. I want to create an
> S3 child class of one of these classes. The parent class has a contractor
> with many arguments. I have been having difficulty writing the child class
> contractor. I have been unable to find a good reference in the internet for
> writing S3 classes. What I have been able to find out so far is that the
> child class constructor should call the parent class constructor … which in
> this case requires passing the argument list with a variable number of
> arguments (i.e. there are a number of optional arguments) from the child to
> the parent.
> So my first question is … is there an easy way to do this? The match.call
> function will return a call object .. however the attributes function when
> used on the call object returns a ‘NULL’.
> My second question is … can any one recommend a good reference for object
> oriented programming in R which includes a comprehensive discussion of the S3
> class model?
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