[Boost-users] composite_key with array member

I am looking for a container where I have to use 5-10 keys to get the value. I am trying to write something like below.. Can some one help to solve this? struct entry { int a[10]; int id; }; using boost::multi_index_container; using namespace boost::multi_index; typedef multi_index_container< entry, indexed_by< ordered_non_unique< composite_key< entry, member<entry,unsigned int,&entry::a> ???? > >, ordered_unique< member<entry,unsigned int,&entry::id> > >

book;

Regards, UJ