- I forgot to add two files and remove a debug print.

- Actually there is some printing issue to fix, but
  the logics works fine.


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@902 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/concrete_simulation.cc

@@ -94,7 +94,6 @@ ConcreteSimulation::jump_to(History::position p)
 
 	if (!yet_to_finish)
 		stop();
-	_history.get_size() << std::endl;
 	_front = p < _front ? p : _front;
 	notify_change();
 }

src/backend/simulation_observer.cc

@@ -0,0 +1,25 @@
+// src/backend/simulation_observer.cc - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#include "simulation_observer.hh"
+
+sgpem::SimulationObserver::~SimulationObserver() {}
+
+// Pure abstract class. Nothing else to put here.

src/backend/simulation_observer.hh

@@ -0,0 +1,44 @@
+// src/backend/simulation_observer.hh - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#ifndef SIMULATION_OBSERVER_HH
+#define SIMULATION_OBSERVER_HH 1
+
+#include "config.h"
+
+namespace sgpem
+{
+  class Simulation;
+  class SimulationObserver;
+
+  class SG_DLLEXPORT SimulationObserver
+  {
+  public:
+    virtual void update(const Simulation& changed_simulation) = 0;
+    virtual ~SimulationObserver();
+
+  }
+  ; // class SimulationObserver
+
+}//~ namespace sgpem
+
+#endif //SIMULATION_OBSERVER_H
+
+