Nodes.hpp

#pragma once

#include <dune/common/version.hh>

namespace AMDiS
{
  // dune version independent creation of node from preBasis
  template <class PB, class TP>
  auto makeNode(PB const& preBasis, [[maybe_unused]] TP const& treePath)
  {
    return preBasis.makeNode();
  }

  // dune version independent extraction of node type from preBasis
  template <class PB, class TP>
  using Node_t = decltype(makeNode(std::declval<PB>(), std::declval<TP>()));


  template <class PB,
    class Tree = typename PB::Node,
    class Iter = typename std::vector<typename PB::MultiIndex>::iterator>
  using PreBasisHasIndicesConcept
    = decltype(std::declval<PB>().indices(std::declval<Tree>(), std::declval<Iter>()));

  struct DummyNodeIndexSet {};

  // dune version independent creation of node from preBasis
  template <class PB, class TP>
  auto makeNodeIndexSet(PB const& preBasis, [[maybe_unused]] TP const& treePath)
  {
    if constexpr(Dune::Std::is_detected_v<PreBasisHasIndicesConcept,PB>)
      return DummyNodeIndexSet{};
    else
      return preBasis.makeIndexSet();
  }

  // dune version independent extraction of node indexset type from preBasis
  template <class PB, class TP>
  using NodeIndexSet_t = decltype(makeNodeIndexSet(std::declval<PB>(), std::declval<TP>()));

} // end namespace AMDiS