/usr/include/dune/grid/yaspgrid/yaspgridhierarchiciterator.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_YASPGRIDHIERARCHICITERATOR_HH
#define DUNE_GRID_YASPGRIDHIERARCHICITERATOR_HH
/** \file
* The YaspHierarchicIterator class
*
* Enables iteration over son entities of codim 0
*/
namespace Dune {
/** \brief YaspHierarchicIterator enables iteration over son entities of codim 0
*/
template<class GridImp>
class YaspHierarchicIterator :
public YaspEntityPointer<0,GridImp>
{
enum { dim=GridImp::dimension };
public:
// types used from grids
typedef typename GridImp::YGridLevelIterator YGLI;
typedef typename SubYGrid<dim,typename GridImp::ctype>::TransformingSubIterator TSI;
typedef typename GridImp::template Codim<0>::Entity Entity;
//! constructor
YaspHierarchicIterator (const GridImp* yg, const YGLI& g, const TSI& it, int maxlevel) :
YaspEntityPointer<0,GridImp>(yg,g,it)
{
// now iterator points to current cell
StackElem se(this->_g);
std::copy(this->_it.coord().begin(), this->_it.coord().end(), se.coord.begin());
stack.push(se);
// determine maximum level
_maxlevel = std::min(maxlevel,this->_g->mg->maxLevel());
// if maxlevel not reached then push yourself and sons
if (this->_g->level()<_maxlevel)
{
push_sons();
}
// and make iterator point to first son if stack is not empty
if (!stack.empty())
pop_tos();
}
//! constructor
YaspHierarchicIterator (const YaspHierarchicIterator& it) :
YaspEntityPointer<0,GridImp>(it),
_maxlevel(it._maxlevel), stack(it.stack)
{}
//! increment
void increment ()
{
// sanity check: do nothing when stack is empty
if (stack.empty()) return;
// if maxlevel not reached then push sons
if (this->_g->level()<_maxlevel)
push_sons();
// in any case pop one element
pop_tos();
}
void print (std::ostream& s) const
{
s << "HIER: " << "level=" << this->_g.level()
<< " position=" << this->_it.coord()
<< " superindex=" << this->_it.superindex()
<< " maxlevel=" << this->_maxlevel
<< " stacksize=" << stack.size()
<< std::endl;
}
private:
int _maxlevel; //!< maximum level of elements to be processed
struct StackElem {
YGLI g; // grid level of the element
array<int,dim> coord; // and the coordinates
StackElem(YGLI gg) : g(gg) {}
};
std::stack<StackElem> stack; //!< stack holding elements to be processed
// push sons of current element on the stack
void push_sons ()
{
// yes, process all 1<<dim sons
YGLI finer = this->_g;
++finer;
StackElem se(finer);
for (int i=0; i<(1<<dim); i++)
{
for (int k=0; k<dim; k++)
if (i&(1<<k))
se.coord[k] = this->_it.coord(k)*2+1;
else
se.coord[k] = this->_it.coord(k)*2;
stack.push(se);
}
}
// make TOS the current element
void pop_tos ()
{
StackElem se = stack.top();
stack.pop();
this->_g = se.g;
this->_it.reinit(this->_g->cell_overlap,se.coord);
}
};
} // namespace Dune
#endif // DUNE_GRID_YASPGRIDHIERARCHICITERATOR_HH
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