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diff --git a/src/engine/machina/Schrodinbit.hpp b/src/engine/machina/Schrodinbit.hpp
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+++ b/src/engine/machina/Schrodinbit.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 St, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef SCHRODINBIT_HPP
+#define SCHRODINBIT_HPP
+
+
+/** A flag which becomes false when it's value is observed
+ */
+class Schrodinbit {
+public:
+	Schrodinbit() : _flag(false) {}
+
+	inline operator bool() {
+		const bool ret = _flag;
+		_flag = false;
+		return ret;
+	}
+
+	inline bool operator=(bool flag) {
+		_flag = flag;
+		return flag;
+	}
+
+private:
+	bool _flag;
+};
+
+
+#endif // SCHRODINBIT_HPP
+