void assertOk() const { massert( 14809, "Invalid access for cursor that is not ok()", !_currLoc().isNull() ); }
DiskLoc QueryOptimizerCursorImpl::currLoc() { return _takeover ? _takeover->currLoc() : _currLoc(); }
virtual DiskLoc currLoc() { return _takeover ? _takeover->currLoc() : _currLoc(); }