CGAL 5.2.2 - Surface Mesh Topology
Surface_mesh_topology/path_homotopy_with_symbols.cpp
#include <CGAL/Polygonal_schema.h>
#include <CGAL/Path_on_surface.h>
#include <CGAL/Curves_on_surface_topology.h>
#include <iostream>
#include <cstdlib>
int main()
{
PS ps;
ps.add_facet("a b -a -b c d -c -d");
Path_on_surface<PS> p2(ps); p2.push_back_by_label("b c a -c -b");
bool res1=cst.are_freely_homotopic(p1, p2);
std::cout<<"Paths p1 and p2 "<<(res1?"ARE":"ARE NOT")
<<" freely homotopic."<<std::endl;
bool res2=cst.are_base_point_homotopic(p1, p2);
std::cout<<"Paths p1 and p2 "<<(res2?"ARE":"ARE NOT")
<<" base point homotopic."<<std::endl;
return EXIT_SUCCESS;
}