From c9f68644e78ba49950c30812052c61b3fbfa7dc6 Mon Sep 17 00:00:00 2001
From: Andreas Butti <andreas.butti@gmail.com>
Date: Sat, 17 Nov 2018 19:13:52 +0100
Subject: [PATCH] Added virtual destructor to all interfaces

---
 src/control/ZoomControl.cpp  | 2 ++
 src/control/ZoomControl.h    | 2 ++
 src/undo/UndoRedoHandler.cpp | 2 ++
 src/undo/UndoRedoHandler.h   | 2 ++
 4 files changed, 8 insertions(+)

diff --git a/src/control/ZoomControl.cpp b/src/control/ZoomControl.cpp
index f93879da..e164f88b 100644
--- a/src/control/ZoomControl.cpp
+++ b/src/control/ZoomControl.cpp
@@ -2,6 +2,8 @@
 
 const double zoomStep = 0.04;
 
+ZoomListener::~ZoomListener() { }
+
 ZoomControl::ZoomControl()
 {
 	XOJ_INIT_TYPE(ZoomControl);
diff --git a/src/control/ZoomControl.h b/src/control/ZoomControl.h
index 40767cd2..b4bf8961 100644
--- a/src/control/ZoomControl.h
+++ b/src/control/ZoomControl.h
@@ -26,6 +26,8 @@ class ZoomListener
 public:
 	virtual void zoomChanged(double lastZoom) = 0;
 	virtual void zoomRangeValuesChanged();
+
+	virtual ~ZoomListener();
 };
 
 class ZoomControl
diff --git a/src/undo/UndoRedoHandler.cpp b/src/undo/UndoRedoHandler.cpp
index 0b5da8b2..d6f105d0 100644
--- a/src/undo/UndoRedoHandler.cpp
+++ b/src/undo/UndoRedoHandler.cpp
@@ -49,6 +49,8 @@ void printUndoList(GList* list)
 #define PRINTCONTENTS()
 #endif //UNDO_TRACE
 
+UndoRedoListener::~UndoRedoListener() { }
+
 UndoRedoHandler::UndoRedoHandler(Control* control)
 {
 	XOJ_INIT_TYPE(UndoRedoHandler);
diff --git a/src/undo/UndoRedoHandler.h b/src/undo/UndoRedoHandler.h
index 9d116494..00ea1f1e 100644
--- a/src/undo/UndoRedoHandler.h
+++ b/src/undo/UndoRedoHandler.h
@@ -21,6 +21,8 @@ class UndoRedoListener
 public:
 	virtual void undoRedoChanged() = 0;
 	virtual void undoRedoPageChanged(PageRef page) = 0;
+
+	virtual ~UndoRedoListener();
 };
 
 class UndoRedoHandler