namespace leveldb {
class Comparator;
class DB;
+class FilterPolicy;
class Env;
class Snapshot;
}
scoped_ptr<leveldb::Env> env_;
scoped_ptr<leveldb::Comparator> comparator_adapter_;
scoped_ptr<leveldb::DB> db_;
+ scoped_ptr<const leveldb::FilterPolicy> filter_policy_;
const LevelDBComparator* comparator_;
};