--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Toolbox/UndoRedoStack.cpp	Mon Nov 12 14:52:10 2018 +0100
@@ -0,0 +1,89 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2018 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/>.
+ **/
+
+
+#include "UndoRedoStack.h"
+
+#include <Core/OrthancException.h>
+
+#include <cassert>
+
+namespace OrthancStone
+{
+  void UndoRedoStack::Clear(UndoRedoStack::Stack::iterator from)
+  {
+    for (Stack::iterator it = from; it != stack_.end(); ++it)
+    {
+      assert(*it != NULL);
+      delete *it;
+    }
+
+    stack_.erase(from, stack_.end());
+  }
+
+
+  UndoRedoStack::UndoRedoStack() :
+    current_(stack_.end())
+  {
+  }
+
+  
+  UndoRedoStack::~UndoRedoStack()
+  {
+    Clear(stack_.begin());
+  }
+
+  
+  void UndoRedoStack::Add(ICommand* command)
+  {
+    if (command == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+    }
+      
+    Clear(current_);
+
+    stack_.push_back(command);
+    current_ = stack_.end();
+  }
+
+  
+  void UndoRedoStack::Undo()
+  {
+    if (current_ != stack_.begin())
+    {
+      --current_;
+        
+      assert(*current_ != NULL);
+      (*current_)->Undo();
+    }
+  }
+
+  void UndoRedoStack::Redo()
+  {
+    if (current_ != stack_.end())
+    {
+      assert(*current_ != NULL);
+      (*current_)->Redo();
+
+      ++current_;
+    }
+  }
+}