[Rcpp-devel] How to set a default value when call a R function in Rcpp

[Jingyu He]

Hi,


I'm writing a R package by Rcpp and I have a problem when setting default
value when call a R function in Rcpp. Here is an example to pass a R
function to C++, provided by http://adv-r.had.co.nz/Rcpp.html

#include <Rcpp.h>using namespace Rcpp;// [[Rcpp::export]]RObject
callWithOne(Function f) {
  return f(1);}

The question is, how to set the default value for f? I would like to have
the choice to pass a function or not, like

callWithOne(Function f = NULL) {
  // if pass f, run f(1)
  // else, run something else}


Thanks!

Best,
Jingyu He
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