/usr/include/dune/pdelab/finiteelementmap/rt0simplex2dfem.hh is in libdune-pdelab-dev 2.0.0-1.
This file is owned by root:root, with mode 0o644.
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#ifndef DUNE_PDELAB_FINITEELEMENTMAP_RT0SIMPLEX2DFEM_HH
#define DUNE_PDELAB_FINITEELEMENTMAP_RT0SIMPLEX2DFEM_HH
#include<vector>
#include<dune/localfunctions/raviartthomas/raviartthomas02d.hh>
#include"finiteelementmap.hh"
namespace Dune {
namespace PDELab {
//! wrap up element from local functions
//! \ingroup FiniteElementMap
template<typename GV, typename D, typename R>
class RT0Simplex2DLocalFiniteElementMap :
public LocalFiniteElementMapInterface<LocalFiniteElementMapTraits< Dune::RT02DLocalFiniteElement<D,R> >,
RT0Simplex2DLocalFiniteElementMap<GV,D,R> >
{
typedef Dune::RT02DLocalFiniteElement<D,R> FE;
typedef typename GV::IndexSet IndexSet;
public:
//! \brief export type of the signature
typedef LocalFiniteElementMapTraits<FE> Traits;
//! \brief Use when Imp has a standard constructor
RT0Simplex2DLocalFiniteElementMap (const GV& gv_)
: gv(gv_), is(gv_.indexSet()), orient(gv_.size(0))
{
// create all variants
for (int i=0; i<8; i++)
variant[i] = FE(i);
// compute orientation for all elements
typedef typename GV::Traits::template Codim<0>::Iterator ElementIterator;
typedef typename GV::IntersectionIterator IntersectionIterator;
// loop once over the grid
for (ElementIterator it = gv.template begin<0>(); it!=gv.template end<0>(); ++it)
{
typename IndexSet::IndexType myid = is.template index<0>(*it);
orient[myid] = 0;
IntersectionIterator endit = gv.iend(*it);
for (IntersectionIterator iit = gv.ibegin(*it); iit!=endit; ++iit)
if (iit->neighbor())
{
if (is.template index<0>(*(iit->outside()))>myid)
orient[myid] |= 1<<iit->indexInInside();
}
}
}
//! \brief get local basis functions for entity
template<class EntityType>
const typename Traits::FiniteElementType& find (const EntityType& e) const
{
return variant[orient[is.template index<0>(e)]];
}
bool fixedSize() const
{
return true;
}
std::size_t size(GeometryType gt) const
{
return gt.isLine() ? 1 : 0;
}
std::size_t maxLocalSize() const
{
return 3;
}
private:
GV gv;
FE variant[8];
const IndexSet& is;
std::vector<unsigned char> orient;
};
}
}
#endif // DUNE_PDELAB_FINITEELEMENTMAP_RT0SIMPLEX2DFEM_HH
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