// We show how a lambda expression can be used instead.

#include <iostream>
#include <list>
#include <numeric>     // accumulate
#include <functional>  // binary_function

int main(){
  std::list<double> lst;
  for(int i = 1; i <= 10; i++) lst.push_back(i);   // 1, 2, ..., 10

  // We can also supply a lambda expression.
  double res = std::accumulate(lst.begin(), lst.end(), 0.0, 
                               [](const double& d, const double& e){return d + e;});

  std::cout << "The plus accumulation is: " << res << std::endl;       // 55
}