Small correction to the code:
//------- code start --------------------------------
#include <algorithm>
#include <map>
#include <string>
#include <iostream>

#include <boost/lambda/lambda.hpp>
#include <boost/lambda/bind.hpp>

typedef std::map<int, int> MyMap;

std::ostream& operator << (std::ostream& outs, const MyMap& a)
{
       std::for_each(a.begin(), a.end(),
               outs << boost::lambda::bind(&MyMap::value_type::second, boost::lambda::_1) << "\n");
       return outs;
}

int main()
{
       MyMap a;
       std::cout << a; }
//------- code end ---------------------------------

Pavel

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