pop for c++ map/multimap, works like the Python::dict method

pop.hpp

template<typename M>
M::mapped_type pop(M &m, M::const_iterator it)
{
	assert (it != m.end());
	M::mapped_type result = *it;
	m.erase(it);
	return result;
}

template<typename M>
M::mapped_type pop(M &m)
{
	return pop(m, m.begin());
}

template<typename M>
M::mapped_type pop(M &m, const M::key_type &k)
{
	return pop(m, m.find(k));
}