cout_map.cpp

#include <iostream>
#include <string>
#include <map>

using namespace std;

template <typename K, typename V, class C, class A>
ostream &operator<< (ostream &os, map<K,V,C,A> const& m)
{
	os << "{ ";
	typename map<K,V,C,A>::const_iterator p;
	for (p = m.begin(); p != m.end(); ++p) {
		os << p->first << ":" << p->second << ", ";
	}
	return os << "}";
}

int main (int argc, char *argv[])
{
	typedef map<int, string> Map1;
	typedef map<double, Map1> Map2;

	Map2 m;
	m.insert (make_pair (1.2, Map1 ()));
	m[1.2].insert (make_pair (3, "three"));
	m[1.2].insert (make_pair (5, "five"));

	m.insert (make_pair (.5, Map1 ()));
	m[.5].insert (make_pair (5, "five"));
	m[.5].insert (make_pair (1, "one"));
	m[.5].insert (make_pair (9, "nine"));

	cout << m << endl;
}