Hey,
I asked this question on stackoverflow (
https://stackoverflow.com/questions/54234934/how-to-provide-a-custom-generator-constructor-for-an-rcpp-class)
a while back but never got an answer, so I'm trying my luck here.
-----
I've written R bindings for my C++ library, but for usability I would like
to change the behavior of the methods and constructors somewhat in R:
adding defaults and packing variables into a list.
For example: instead of calling the generator ClassName(name, list(var1=1,
var2=2)), I would like to have ClassName(name, var1=1, var2=2)
Initially I was just using loadModules and using the C++ methods directly,
but then switched to setRcppClass which allows me to override the methods
including initialize. At first I tried using callNextMethod to no avail and
then basically resorted to copy-pasting what the Rcpp provided
initialize method
does with some small adjustments.
setRcppClass("ClassName", module="mymodule",
methods=list(
initialize=function(.Object, name, ...) {
args <- list(...)
argNames <- allNames(args)
cppArgs <- nzchar(argNames)
.CppObject <<- .CppGenerator$new(name, args[cppArgs])
},
show=function() {
cat('ClassName of type:', .CppObject$name(), '\n')
}))
This does almost what I want, except that I need to explicitly name the name
parameter: ClassName(name="Foo", var1=1, var2=2)
Obviously I also want to avoid copying the Rcpp code, but instead call it
somehow.
Additionally R CMD check is complaining about all references to .CppGenerator
.CppObject allNames
-------
Thanks a lot in advance
Tom Haber
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