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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
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