Example Rcpp armadillo comparison double to vec

test.cpp

// [[Rcpp::depends(RcppArmadillo)]]
#include <RcppArmadillo.h>
using namespace arma;

// [[Rcpp::export]]
vec testfun(const vec &x,
            const double &y,
            const double &z)
{
    vec out = ((y < x) - z) % (x - y);
    return out;
}