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+/* This file is part of the OpenLB library
+ *
+ * Copyright (C) 2019 Adrian Kummerlaender
+ * E-mail contact: info@openlb.net
+ * The most recent release of OpenLB can be downloaded at
+ * <http://www.openlb.net/>
+ *
+ * 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) any later version.
+ *
+ * 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, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+*/
+
+#ifndef UTILITIES_META_H
+#define UTILITIES_META_H
+
+#include <type_traits>
+
+namespace olb {
+
+namespace utilities {
+
+namespace meta {
+
+/// Provide implementation of std::enable_if_t
+/**
+ * Weirdly version 18.0.3 of the Intel C++ compiler doesn't provide this
+ * useful template alias despite otherwise supporting C++14.
+ **/
+template<bool B, class T = void>
+using enable_if_t = typename std::enable_if<B,T>::type;
+
+/// Check whether a given type list contains WANTED
+template <
+ typename WANTED,
+ typename HEAD = void, // Default argument in case the list is empty
+ typename... TAIL
+>
+struct list_contains_item {
+ using type = typename std::conditional<
+ std::is_same<WANTED, HEAD>::value,
+ std::true_type,
+ typename list_contains_item<WANTED, TAIL...>::type
+ >::type;
+};
+
+template <typename WANTED, typename HEAD>
+struct list_contains_item<WANTED, HEAD> {
+ using type = typename std::is_same<WANTED, HEAD>::type;
+};
+
+
+/// Get first type based on BASE contained in a given type list
+/**
+ * If no such list item exists, type is void.
+ **/
+template <
+ typename BASE,
+ typename HEAD = void, // Default argument in case the list is empty
+ typename... TAIL
+>
+struct list_item_with_base {
+ using type = typename std::conditional<
+ std::is_base_of<BASE, HEAD>::value,
+ HEAD,
+ typename list_item_with_base<BASE, TAIL...>::type
+ >::type;
+};
+
+template <typename BASE, typename HEAD>
+struct list_item_with_base<BASE, HEAD> {
+ using type = typename std::conditional<
+ std::is_base_of<BASE, HEAD>::value,
+ HEAD,
+ void
+ >::type;
+};
+
+}
+
+}
+
+}
+
+#endif