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diff --git a/src/engine/Schrodinbit.hpp b/src/engine/Schrodinbit.hpp
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+/*
+  This file is part of Machina.
+  Copyright 2007-2013 David 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 3 of the License, or 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 more details.
+
+  You should have received a copy of the GNU General Public License
+  along with Machina.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef SCHRODINBIT_HPP
+#define SCHRODINBIT_HPP
+
+/** A flag which becomes false when its 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