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 <map>
#include <string>
#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
map<string,double> coll { { "tim", 9.9 },
{ "struppi", 11.77 }
} ;
// square the value of each element:
for_each (coll.begin(), coll.end(),
[] (pair<const string,double>& elem) {
elem.second *= elem.second;
});
// print each element:
for_each (coll.begin(), coll.end(),
[] (const map<string,double>::value_type& elem) {
cout << elem.first << ": " << elem.second << endl;
});
}