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diff --git a/ingen/types.hpp b/ingen/types.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2013 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_TYPES_HPP
+#define INGEN_TYPES_HPP
+
+#include <memory>
+
+namespace Ingen {
+
+template <class T>
+using SPtr = std::shared_ptr<T>;
+
+template <class T>
+using WPtr = std::weak_ptr<T>;
+
+template <class T>
+void NullDeleter(T* ptr) {}
+
+template<class T, class U> 
+SPtr<T> static_ptr_cast(const SPtr<U>& r) {
+	return std::static_pointer_cast<T>(r);
+}
+
+template<class T, class U> 
+SPtr<T> dynamic_ptr_cast(const SPtr<U>& r) {
+	return std::dynamic_pointer_cast<T>(r);
+}
+
+template<class T, class U> 
+SPtr<T> const_ptr_cast(const SPtr<U>& r) {
+	return std::const_pointer_cast<T>(r);
+}
+
+} // namespace Ingen
+
+#endif // INGEN_TYPES_HPP
+