Contents
QLandmarkUnionFilter Class Reference
The QLandmarkUnionFilter class provides a filter which unions the results of its constituent filters. More...
#include <QLandmarkUnionFilter>
Inherits QLandmarkFilter.
Public Functions
QLandmarkUnionFilter () | |
QLandmarkUnionFilter ( const QLandmarkFilter & other ) | |
virtual | ~QLandmarkUnionFilter () |
void | append ( const QLandmarkFilter & filter ) |
void | clear () |
QList<QLandmarkFilter> | filters () const |
void | prepend ( const QLandmarkFilter & filter ) |
void | remove ( const QLandmarkFilter & filter ) |
void | setFilters ( const QList<QLandmarkFilter> & filters ) |
QLandmarkUnionFilter & | operator<< ( const QLandmarkFilter & filter ) |
- 4 public functions inherited from QLandmarkFilter
Detailed Description
The QLandmarkUnionFilter class provides a filter which unions the results of its constituent filters.
Conceptually it performs an OR operation and may thus be used to select landmarks which match any one of it's constituent filters.
Whether a union filter can be comprised of compound filters (i.e. union or intersection filters) is backend specific. Even if this is supported the performance of such a filter is likely to be poor.