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And now for something completely difference, the reduce function, doing something similar to what the Reduce function does in R:
#include <Rcpp.h>
using namespace Rcpp ;
// [[Rcpp::export]]
double reduce_example(NumericVector x ){
auto add = [](double a, double b){ return a + b ;} ;
return reduce(x, add ) ;
}
/*** R
x <- 1:10
reduce_example(x)
*/
Giving:
$ Rcpp11Script /tmp/reduce.cpp > x <- 1:10 > reduce_example(x) [1] 55
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