--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Toolbox/UndoRedoStack.h	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,64 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include <boost/noncopyable.hpp>
+#include <list>
+
+
+namespace OrthancStone
+{
+  class UndoRedoStack : public boost::noncopyable
+  {
+  public:
+    class ICommand : public boost::noncopyable
+    {
+    public:
+      virtual ~ICommand()
+      {
+      }
+      
+      virtual void Undo() const = 0;
+      
+      virtual void Redo() const = 0;
+    };
+
+  private:
+    typedef std::list<ICommand*>  Stack;
+
+    Stack            stack_;
+    Stack::iterator  current_;
+
+    void Clear(Stack::iterator from);
+
+  public:
+    UndoRedoStack();
+    
+    ~UndoRedoStack();
+    
+    void Add(ICommand* command);
+    
+    void Undo();
+
+    void Redo();
+  };
+}