r - calling function from package in rcpp code -

this question has answer here:

• calling user-defined r function c++ using rcpp 1 answer

i have package x in r. package has function foo(). want call function foo() in cpp file (using rcpp). possible?

#include <rcpp.h>  void function01() {      // call foo() package x ?? } 

this sort of duplicate. though, majority of cases not involve calling user defined package.

as result, mold 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 c++   rcpp::function rfunction = package_env["function_name"];        // call function , receive output (might not list)   rcpp::list test_out = rfunction(....);  }