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diff --git a/async/src/async_impl.h b/async/src/async_impl.h
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+/*
+ * Copyright 2014  Daniel Vrátil <dvratil@redhat.com>
+ *
+ * This program 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) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef ASYNC_IMPL_H
+#define ASYNC_IMPL_H
+
+#include "async.h"
+
+namespace Async {
+
+namespace detail {
+
+template<typename T>
+struct identity
+{
+    typedef T type;
+};
+
+template<typename T, typename Enable = void>
+struct isIterable {
+    enum { value = 0 };
+};
+
+template<typename T>
+struct isIterable<T, typename std::conditional<false, typename T::iterator, void>::type> {
+    enum { value = 1 };
+};
+
+} // namespace Detail
+
+} // namespace Async
+
+#endif // ASYNC_IMPL_H