backends/concepts.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
 
// SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file AUTHORS.md
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception OR LGPL-3.0-or-later
 
#ifndef DUNE_FUNCTIONS_BACKEND_CONCEPTS_HH
#define DUNE_FUNCTIONS_BACKEND_CONCEPTS_HH
 
 
#include <utility>
 
#include <dune/common/concept.hh>
 
namespace Dune {
namespace Functions {
namespace Concept {
 
using namespace Dune::Concept;
 
 
// Concept for a ConstVectorBackend
template<class GlobalBasis>
struct ConstVectorBackend
{
  template<class V>
  auto require(const V& v) -> decltype(
    v[std::declval<typename GlobalBasis::MultiIndex>()]
  );
};
 
// Concept for a VectorBackend
template<class GlobalBasis>
struct VectorBackend : Refines<ConstVectorBackend<GlobalBasis>>
{
  template<class V>
  auto require(const V& v) -> decltype(
    const_cast<V&>(v).resize(std::declval<const GlobalBasis&>()),
    const_cast<V&>(v)[std::declval<typename GlobalBasis::MultiIndex>()] = v[std::declval<typename GlobalBasis::MultiIndex>()]
  );
};
 
} // namespace Dune::Functions::Concept
} // namespace Dune::Functions
} // namespace Dune
 
 
#endif // DUNE_FUNCTIONS_BACKEND_CONCEPTS_HH