factory.hh

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#ifndef DUNE_MULTIDOMAINGRID_FACTORY_HH
#define DUNE_MULTIDOMAINGRID_FACTORY_HH
 
#include <dune/grid/common/exceptions.hh>
 
#include <dune/geometry/type.hh>
 
#include <optional>
#include <memory>
 
namespace Dune {
 
namespace mdgrid {
 
// forward declaration
template<typename HostGrid,typename MDGridTraits>
class MultiDomainGrid;
 
} // namespace mdgrid
 
// forward declaration
template <class GridType>
class GridFactoryInterface;
 
template <class GridType>
class GridFactory;
 
template<class HostGrid, class MDGTraits>
class GridFactory<Dune::mdgrid::MultiDomainGrid<HostGrid, MDGTraits>> : public GridFactoryInterface<Dune::mdgrid::MultiDomainGrid<HostGrid, MDGTraits>> {
 
  using Grid = Dune::mdgrid::MultiDomainGrid<HostGrid, MDGTraits>;
  using Base = GridFactoryInterface<Grid>;
public:
 
  GridFactory()
    : _host_grid_factory{}
  {}
 
  // use default implementation from base class
  using Base::insertBoundarySegment;
 
  void insertVertex(const FieldVector<typename Grid::ctype, Grid::dimensionworld>& pos) override {
    _host_grid_factory.insertVertex(pos);
  }
 
  void insertElement(const GeometryType& type, const std::vector<unsigned int>& vertices) override {
    _host_grid_factory.insertElement(type, vertices);
  }
 
  void insertBoundarySegment(const std::vector<unsigned int>& vertices) override {
    _host_grid_factory.insertBoundarySegment(vertices);
  }
 
  std::unique_ptr<Grid> createGrid() override  {
    if (not _grid_ptr)
      makeGrid();
    assert(_grid_ptr);
    return std::exchange(_grid_ptr, nullptr);
  }
 
  void makeGrid(std::optional<typename MDGTraits::SubDomainIndex> max_subdomains = {}) {
    assert(not _grid_ptr);
 
    std::unique_ptr<MDGTraits> traits;
    if constexpr (Grid::maxSubDomainIndexIsStatic())
      traits = std::make_unique<MDGTraits>();
    else {
      if (not max_subdomains.has_value())
        DUNE_THROW(GridError, "MultiDomainGrid needs a maximum number of subdomains, but none is provided");
      traits = std::make_unique<MDGTraits>(*max_subdomains);
    }
 
    if (max_subdomains.has_value() and traits->maxSubDomainIndex() < *max_subdomains)
      DUNE_THROW(GridError, "Maximum number of sub-domains is bigger than what grid traits allows");
 
    _grid_ptr = std::make_unique<Grid>(_host_grid_factory.createGrid(), *traits);
  }
 
  Grid& grid() {
    assert(_grid_ptr);
    return *_grid_ptr;
  }
 
  HostGrid& hostGrid() {
    assert(_host_grid_ptr);
    return *_host_grid_ptr;
  }
 
  const std::shared_ptr<HostGrid>& hostGridPtr() {
    return _host_grid_ptr;
  }
 
 
  Dune::GridFactory<HostGrid>& hostGridFactory() {
    return _host_grid_factory;
  }
 
private:
  Dune::GridFactory<HostGrid> _host_grid_factory;
  std::shared_ptr<HostGrid> _host_grid_ptr;
  std::unique_ptr<Grid> _grid_ptr;
};
 
} // namespace Dune
 
#endif // DUNE_MULTIDOMAINGRID_FACTORY_HH