Initialize at openlb-1-3

1 files changed, 75 insertions, 0 deletions

diff --git a/src/dynamics/descriptorTag.h b/src/dynamics/descriptorTag.h
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+++ b/src/dynamics/descriptorTag.h
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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 DESCRIPTOR_TAG_H
+#define DESCRIPTOR_TAG_H
+
+#include "utilities/meta.h"
+
+namespace olb {
+
+namespace descriptors {
+
+/// \defgroup descriptor
+//@{
+
+/// Base of a descriptor tag
+struct DESCRIPTOR_TAG {
+  template <unsigned, unsigned>
+  static constexpr unsigned size()
+  {
+    return 0; // a tag doesn't have a size
+  }
+};
+
+namespace tag {
+
+/// Base of all tags describing the _category_ of a descriptor
+/**
+ * e.g. RTLBM, MRT
+ **/
+struct CATEGORY { };
+
+/// Implicit default category of _normal_ descriptors
+struct DEFAULT : public CATEGORY, public DESCRIPTOR_TAG { };
+
+/// Returns first item of FIELDS type list that is derived from BASE.
+/**
+ * If such a type list item doesn't exist, FALLBACK is _returned_.
+ **/
+template <typename BASE, typename FALLBACK, typename... FIELDS>
+using field_with_base = typename std::conditional<
+  std::is_void<typename utilities::meta::list_item_with_base<BASE, FIELDS...>::type>::value,
+  FALLBACK,
+  typename utilities::meta::list_item_with_base<BASE, FIELDS...>::type
+>::type;
+
+}
+
+//@}
+
+}
+
+}
+
+#endif