+ pure virtual SetBase::model()

GUI/Model/Type/SetWithModel.h

@@ -32,6 +32,9 @@ class SetBase : public QObject {
 public:
     explicit SetBase(QObject* parent = nullptr);
     virtual ~SetBase();
+
+    virtual QAbstractListModel* model() = 0;
+
 signals:
     void setChanged() const;
     void currentModified() const;
@@ -122,7 +125,7 @@ public:
     Iterator begin() { return m_vec.begin(); }
     Iterator end() { return m_vec.end(); }
 
-    QAbstractListModel* model() { return m_qmodel.get(); }
+    QAbstractListModel* model() override { return m_qmodel.get(); }
 
 private:
     void update_current()