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+/*
+  This file is part of Ingen.
+  Copyright 2007-2016 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or any later version.
+
+  Ingen 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_ENGINE_TEE_HPP
+#define INGEN_ENGINE_TEE_HPP
+
+#include <cstddef>
+#include <mutex>
+#include <set>
+#include <utility>
+
+#include "ingen/Interface.hpp"
+#include "ingen/Message.hpp"
+#include "ingen/types.hpp"
+
+namespace Ingen {
+
+/** Interface that forwards all calls to several sinks. */
+class Tee : public Interface
+{
+public:
+	typedef std::set< SPtr<Interface> > Sinks;
+
+	explicit Tee(Sinks sinks) : _sinks(std::move(sinks)) {}
+
+	SPtr<Interface> respondee() const override {
+		return (*_sinks.begin())->respondee();
+	}
+
+	void set_respondee(SPtr<Interface> respondee) override {
+		(*_sinks.begin())->set_respondee(respondee);
+	}
+
+	void message(const Message& message) override {
+		std::lock_guard<std::mutex> lock(_sinks_mutex);
+		for (const auto& s : _sinks) {
+			s->message(message);
+		}
+	}
+
+	URI uri() const override { return URI("ingen:/tee"); }
+
+private:
+	std::mutex _sinks_mutex;
+	Sinks      _sinks;
+};
+
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_TEE_HPP