leafprebasismixin.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_FUNCTIONSPACEBASES_LEAFPREBASISMIXIN_HH
#define DUNE_FUNCTIONS_FUNCTIONSPACEBASES_LEAFPREBASISMIXIN_HH
 
#include <cassert>
#include <cstddef>
#include <type_traits>
 
#include <dune/functions/functionspacebases/containerdescriptors.hh>
 
namespace Dune::Functions {

template<class Derived>
class LeafPreBasisMixin
{
public:
  using size_type = std::size_t;

  static constexpr size_type maxMultiIndexSize = 1;

  static constexpr size_type minMultiIndexSize = 1;

  static constexpr size_type multiIndexBufferSize = 1;

  template<class SizePrefix,
    decltype(std::declval<SizePrefix>().size(), bool{}) = true>
  size_type size(const SizePrefix& prefix) const
  {
    assert(prefix.size() == 0 || prefix.size() == 1);
    return (prefix.size() == 0) ? derived().dimension() : 0;
  }

  size_type size() const
  {
    return derived().dimension();
  }

  auto containerDescriptor() const
  {
    return ContainerDescriptors::FlatVector{size()};
  }
 
private:
  const Derived& derived() const
  {
    return static_cast<const Derived&>(*this);
  }
};
 
 
} // end namespace Dune::Functions
 
 
#endif // DUNE_FUNCTIONS_FUNCTIONSPACEBASES_LEAFPREBASISMIXIN_HH