Nullable should be able to take R_NilValue as a default parameter in a function

[dcdillon]

It currently can't.

[dcdillon]

To elaborate, the following code didn't compile before because of the protected constructor Nullable(SEXP rhs). The constructor is no longer protected.

#include <string>
#include <vector>
#include <Rcpp.h>

// [[Rcpp::export]]
double getFirst(Rcpp::Nullable< Rcpp::NumericVector > v = R_NilValue)
{
        if (!v.isNull())
        {
                return Rcpp::as< Rcpp::NumericVector >(v)[0];
        }

        return NA_REAL;
}

[eddelbuettel]

+1 -- that was on my TODO list for today as well.