A 'true' R-wrapper for C++ classes
Sorry about the mistake in the previous post, here is the corrected version:
And I've just added responses to part of it:
(3) The above model lacks something like an 'environment' for the pointer to the C++ object to live in it. Assume we create the foo class in R like: obj <- foo$new() Now, the following would return an error: obj$fun() and the reason is that the pointer created in the initialize method is lost. (4) The question is how to assign an environment to the pointers. A well described answer, rather than some abstract hints, is well-appreciated.
I think you'll have to ask the OOP author this one. Generally R doesn't have pointers, so when a package provides them, it needs to do a lot of low level support for them.
Also I am curious to know why there is no standard method for R to wrap C++ classes, something like JNI.
I think it would be harder to write such a thing, in that R and C++ are more different than Java and C++ are. Duncan Murdoch