I am using boost::pool_alloc with std::map like this: typedef map<int, int, less<int>, pool_alloc<pair<int, int> > > MapT; MapT myMap; After myMap passes out of scope, I want to release unused memory from the pool. To do that, I need to get the type used to request chunks from the pool. pair<int, int> is not the answer since map uses rebind to get a different allocator. So how do I go about obtaining the correct singleton_pool interface? Your help is appreciated. -- Kevin Lin