The following code example is taken from the book
The C++ Standard Library - A Tutorial and Reference, 2nd Edition
by Nicolai M. Josuttis, Addison Wesley Longman, 2012
Copyright © 2012 by Pearson Education, Inc. and Nicolai M. Josuttis
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main()
{
vector<int> coll = { 1, 2, 3, 4, 5, 6, 7, 8 };
// process and print mean value
long sum = 0;
for_each (coll.begin(), coll.end(), // range
[&sum] (int elem) {
sum += elem;
});
double mv = static_cast<double>(sum)/static_cast<double>(coll.size());
cout << "mean value: " << mv << endl;
}