Public Member Functions | |
virtual std::string | operator() (const Xapian::Document &doc) const |
This method takes a Document object and builds a key string from it. |
Results are ordered by the first value. In the event of a tie, the second is used. If this is the same for both, the third is used, and so on.
becomes:
MultiValueKeyMaker sorter; // Primary ordering is forwards on value 4. sorter.add_value(4); // Secondary ordering is reverse on value 5. sorter.add_value(5, true);
virtual std::string Xapian::MultiValueSorter::operator() | ( | const Xapian::Document & | doc | ) | const [virtual] |
This method takes a Document object and builds a key string from it.
These keys are then used for ordering or collapsing matching documents.
Implements Xapian::KeyMaker.