How hard is it to roll up our own small hash_multimap ? I am working on a small project, I wouldn't need anything besides the standard STL (hash_multimap under STL would have been so great).
I don't want to use Boost just for hash_multimap, if I don't have any alternative I might use it though. So what are other alternatives ?

BTW, I just need the map for hash_multimap<string, vector<string> >.