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/*
* Top_faces.h
*
* Created on: Oct 23, 2014
* Author: dsalinas
*/
#ifndef TOP_FACES_H_
#define TOP_FACES_H_
#include <list>
#include <vector>
#include <set>
template<typename SimplexHandle>
std::list<SimplexHandle> subfaces(SimplexHandle top_face){
std::list<SimplexHandle> res;
if(top_face.dimension()==-1) return res;
if(top_face.dimension()==0) {
res.push_back(top_face);
return res;
}
else{
auto first_vertex = top_face.first_vertex();
top_face.remove_vertex(first_vertex);
res = subfaces(top_face);
std::list<SimplexHandle> copy = res;
for(auto& simplex : copy){
simplex.add_vertex(first_vertex);
}
res.push_back(SimplexHandle(first_vertex));
res.splice(res.end(),copy);
return res;
}
}
/**
* add all faces of top_face in simplices_per_dimension
*/
template<typename SimplexHandle>
void register_faces(
std::vector< std::set<SimplexHandle> >& simplices_per_dimension,
const SimplexHandle& top_face){
std::list<SimplexHandle> subfaces_list = subfaces(top_face);
for(auto& simplex : subfaces_list ){
simplices_per_dimension[simplex.dimension()].insert(simplex);
}
}
#endif /* TOP_FACES_H_ */
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