CXX11 Accumulate function examples

cxx11-example-accumulate.hpp

#include <iostream>
#include <string>
#include <numeric>
#include <vector>

int main() {
  
  std::vector<int> v{1,2,3,4,5,6,7,8,9,10};
  auto dash_fold = [](std::string a, int b){
    return a+ "-"+ std::to_string(b);
  };

  int sum = std::accumulate(v.begin(), v.end(),0);
  int product = std::accumulate(v.begin(), v.end(), 1, std::multiplies<int>());
  std::string dashFolded = std::accumulate(std::next(v.begin()), v.end(), 
                                  std::to_string(v[0]), dash_fold);

  std::cout<<"Sum:"<<sum<<std::endl;
  std::cout<<"Product:"<<product<<std::endl;
  std::cout<<"Dash Folded:"<< dashFolded<<std::endl;
}