Invalid selection.
The number of selected nodes must be uneven! the current number is " << nodes.size() << ".
"; return ss.str(); } return std::string(); }; m_Controls.multiSlot->SetSelectionCheckFunction(checkFunction); } else { auto checkFunction = [](const QmitkMultiNodeSelectionWidget::NodeList & /*nodes*/) { return std::string(); }; m_Controls.multiSlot->SetSelectionCheckFunction(checkFunction); } };