I have an external pointer object that I'd like to pass from my R code to
some C code. Per Section 5.13 of "Writing R Extensions", I've noted that
"external pointers should only be used as part of an object with normal
semantics, for example an attribute or an element of a list." So I've
written up a workable C function as such:
SEXP my_c_function(SEXP param) {
SEXP temp = getAttrib(param, install("ptr_attribute"));
void * ptr = R_ExternalPtrAddr(temp);
... // do useful things with ptr
}
I can pass my_c_function() an object with "normal" semantics (such as an
integer vector), where the external pointer object is a parameter named
"ptr_attribute". The function extracts the pointer object from param; i.e.
this function does what I want it to do.
My question is: is there a way to do this using the .C() interface, rather
than .Call()? Using call_R seems a possibility - has anyone had luck
going this route?
Any suggestions appreciated.
Thanks, Patrick
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