I have a package X in R. The package has a function foo(). I want to call the function foo() in a cpp file (using Rcpp). Is it possible?
#include <Rcpp.h>
void function01() {
// call foo() from package X ??
}
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2This is essentially (maybe not quite) a duplicate of stackoverflow.com/q/21225662/1968Konrad Rudolph– Konrad Rudolph2016-08-01 16:55:24 +00:00Commented Aug 1, 2016 at 16:55
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Close enough to a dupe for me. Known feature, well documented, no point in cluttering SO with repeats.Dirk is no longer here– Dirk is no longer here2016-08-01 20:24:28 +00:00Commented Aug 1, 2016 at 20:24
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1 Answer
This is sort of a duplicate. Though, the majority of cases do not involve calling from a user defined package.
As a result, the mold to use is:
#include <Rcpp.h>
using namespace Rcpp;
// [[Rcpp::export]]
void function01(){
// Obtain environment containing function
Rcpp::Environment package_env("package:package_name_here");
// Make function callable from C++
Rcpp::Function rfunction = package_env["function_name"];
// Call the function and receive output (might not be list)
Rcpp::List test_out = rfunction(....);
}
