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diff --git a/src/engine/machina/Action.hpp b/src/engine/machina/Action.hpp
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+++ b/src/engine/machina/Action.hpp
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+/* This file is part of Machina.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Machina 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.
+ * 
+ * Machina 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 details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef MACHINA_ACTION_HPP
+#define MACHINA_ACTION_HPP
+
+#include <string>
+#include <iostream>
+#include "types.hpp"
+
+namespace Machina {
+
+
+struct Action {
+	virtual ~Action() {}
+
+	virtual void execute(Timestamp /*time*/) {}
+};
+
+
+class PrintAction : public Action {
+public:
+	PrintAction(const std::string& msg) : _msg(msg) {}
+
+	void execute(Timestamp time) { std::cout << "t=" << time << ": " << _msg << std::endl; }
+
+private:
+	std::string _msg;
+};
+
+
+} // namespace Machina
+
+#endif // MACHINA_ACTION_HPP