vertexorderfactory.hh

// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
 
#ifndef DUNE_GRID_UTILITY_VERTEXORDERFACTORY_HH
#define DUNE_GRID_UTILITY_VERTEXORDERFACTORY_HH
 
#include <algorithm>
#include <cstddef>
#include <functional>
#include <vector>
 
#include <dune/geometry/referenceelements.hh>
#include <dune/geometry/generalvertexorder.hh>
 
namespace Dune {
 
 
  template<class IdSet, class Index = std::size_t>
  class VertexOrderByIdFactory {
    const IdSet& idset;
 
  public:
    template<std::size_t dim>
    struct VertexOrder {
      typedef GeneralVertexOrder<dim, Index> type;
    };
 
 
    VertexOrderByIdFactory(const IdSet &idset_) : idset(idset_) { }
 
 
    template<typename Element>
    typename VertexOrder<Element::mydimension>::type
    make(const Element &e) const {
      typedef ReferenceElements<
          typename Element::ctype,
          Element::mydimension
          > RefElems;
      std::size_t size =
        RefElems::general(e.type()).size(Element::mydimension);
 
      std::vector<typename IdSet::IdType> ids(size);
      for(std::size_t i = 0; i < size; ++i)
        ids[i] = idset.subId(e, i, Element::mydimension);
      return GeneralVertexOrder<Element::mydimension, Index>
               (e.type(), ids.begin(), ids.end());
    }
  };
 
} // namespace Dune
 
#endif // DUNE_GRID_UTILITY_VERTEXORDERFACTORY_HH