/usr/include/dune/grid/sgrid/generic2dune.hh is in libdune-grid-dev 2.3.1-1.
This file is owned by root:root, with mode 0o644.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_GRID_SGRIDINTERNAL_GENERIC2DUNE_HH
#define DUNE_GRID_SGRIDINTERNAL_GENERIC2DUNE_HH
/** \file
* \brief Renumber from the Dune subentity numbering to the SGrid-internal one
*
* Once upon a time SGrid used a certain system to number its element subentities.
* That system worked, but the code that implemented it wasn't documented.
* So in order to understand that hidden numbering system, a second system was
* implemented additionally, and it was voted that the new system should be the
* official Dune numbering system. For a transitional period code was implemented
* that computed from one system to the other. All code was eventually updated
* to use the new system, except for SGrid. And that is why the transformation
* code from Dune numbering to SGrid numbering is still here.
*/
#include <dune/common/static_assert.hh>
#include <dune/common/singleton.hh>
#include <dune/geometry/type.hh>
#include <dune/geometry/referenceelements.hh>
namespace Dune
{
namespace SGridInternal
{
template< unsigned int dim >
class CubeNumberingTable : public Singleton<CubeNumberingTable<dim> >
{
protected:
using Singleton<CubeNumberingTable<dim> >::instance;
std::vector<unsigned int> generic2dune_[dim+1];
static unsigned int dynamicGeneric2dune(unsigned int i, unsigned int codim)
{
switch(dim)
{
case 3 :
static unsigned int edge[ 12 ] = { 0, 1, 2, 3, 4, 5, 8, 9, 6, 7, 10, 11 };
return (codim == 2 ? edge[ i ] : i);
case 4 :
static unsigned int codim2[ 24 ] =
{ 0, 1, 2, 3, 4, 5, 12, 13, 6, 7, 14, 15,
8, 9, 16, 17, 20, 21, 10, 11, 18, 19, 22, 23 };
static unsigned int codim3[ 32 ] =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16, 17, 24, 25,
18, 19, 26, 27, 12, 13, 14, 15, 20, 21, 28, 29, 22, 23, 30, 31 };
if (codim == 2)
return codim2[i];
else if (codim == 3)
return codim3[i];
else
return i;
default :
return i;
}
}
public:
CubeNumberingTable ()
{
for(unsigned int codim=0; codim<=dim; ++codim)
{
generic2dune_[codim].resize(ReferenceElements<double, dim>::cube().size(codim));
for(unsigned int i=0; i<generic2dune_[codim].size(); ++i)
generic2dune_[codim][i] = dynamicGeneric2dune(i, codim);
}
}
static unsigned int generic2dune (unsigned int i, unsigned int codim )
{
assert(codim <= dim);
return instance().generic2dune_[codim][i];
}
};
}
}
#endif // #ifndef DUNE_GRID_SGRIDINTERNAL_GENERIC2DUNE_HH
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