[Boost-users] boost [pointer container, lambda, bind]

Say lets say i have container of regular type T. And lets say i want to insert them into ptr_vector by getting the keys. template< typename MapType, typename OutputIterator > OutputIterator getKeys(const MapType& map, OutputIterator out ) { typedef typename MapType::value_type map_type; typedef typename OutputIterator::value_type out_type; std::for_each(map.begin(), map.end(), boost::lambda::var(*out)++ = boost::lambda::construct<out_type>(boost::lambda::bind(&map_type::first, boost::lambda::_1)) ); return out; } Is it possble to do this. Assuming outputiterator is implemented for ptr_vector.