I forgot to answer one of your questions. Here it comes: Joerg Walter <jhr.walter <at> t-online.de> writes:
One more question: is there an (easy?) way to iterate over the distinct values of an index
You can do it as you would with a std::multiset: typedef indexed_set<...> indexed_t; typedef indexed_t::index_type<...>::type index_t; indexed_t iset; index_t& index=iset.get<...>(); for(index::iterator it=index.begin();it!=index.end()){ // do what you want to with the value // get next value it2=index.upper_bound(index.key_extractor()(*it)); it=it2; }
(or to define the index as the set of distinct values of the related attribute(s))?
This would call for a new type of index, IHMO. Gotta think it over. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo