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diff --git a/src/engine/OutputPort.h b/src/engine/OutputPort.h
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+/* This file is part of Om.  Copyright (C) 2006 Dave Robillard.
+ * 
+ * Om 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.
+ * 
+ * Om 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.,
+ * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef OUTPUTPORT_H
+#define OUTPUTPORT_H
+
+#include <string>
+#include <cstdlib>
+#include "PortBase.h"
+#include "util/types.h"
+
+namespace Om {
+
+template <typename T> class InputPort;
+
+
+/** An output port.
+ *
+ * Output ports always have a locally allocated buffer, and buffer() will
+ * always return that buffer.  (This is very different from InputPort)
+ *
+ * This class actually adds no functionality to Port whatsoever right now,
+ * it will in the future when more advanced port types exist, and it makes
+ * things clearer throughout the engine.
+ *
+ * \ingroup engine
+ */
+template <typename T>
+class OutputPort : public PortBase<T>
+{
+public:
+	OutputPort(Node* node, const string& name, size_t index, size_t poly, PortInfo* port_info, size_t buffer_size);
+	virtual ~OutputPort() {}
+
+	void set_tied_port(InputPort<T>* port);
+
+private:
+	// Prevent copies (undefined)
+	OutputPort(const OutputPort& copy);
+	OutputPort<T>& operator=(const OutputPort<T>&);
+	
+	using PortBase<T>::m_is_tied;
+	using PortBase<T>::m_tied_port;
+};
+
+
+template class OutputPort<sample>;
+
+} // namespace Om
+
+#endif // OUTPUTPORT_H