\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - Surface Mesh

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Surface_mesh/sm_memory.cpp
#include <iostream>
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Surface_mesh.h>
typedef CGAL::Simple_cartesian<double> K;
typedef CGAL::Surface_mesh<K::Point_3> Mesh;
typedef Mesh::Vertex_index vertex_descriptor;
int main()
{
Mesh m;
Mesh::Vertex_index u;
for(unsigned int i=0; i < 5; ++i){
Mesh::Vertex_index v = m.add_vertex(K::Point_3(0,0,i+1));
if(i==2) u=v;
}
m.remove_vertex(u);
std::cout << "After insertion of 5 vertices and removal of the 3. vertex\n"
<< "# vertices / # vertices + # removed vertices = "
<< m.number_of_vertices()
<< " / " << m.number_of_vertices() + m.number_of_removed_vertices() << std::endl;
std::cout << "Iterate over vertices\n";
{
BOOST_FOREACH(vertex_descriptor vd, m.vertices()){
std::cout << m.point(vd) << std::endl;
}
}
// The status of being used or removed is stored in a property map
Mesh::Property_map<Mesh::Vertex_index,bool> removed
= m.property_map<Mesh::Vertex_index,bool>("v:removed").first;
std::cout << "\nIterate over vertices and deleted vertices\n"
<< "# vertices / # vertices + # removed vertices = "
<< m.number_of_vertices()
<< " / " << m.number_of_vertices() + m.number_of_removed_vertices() << std::endl;
{
unsigned int i = 0, end = m.number_of_vertices() + m.number_of_removed_vertices();
for( ; i < end; ++i) {
vertex_descriptor vh(i);
assert(m.is_removed(vh) == removed[vh]);
std::cout << m.point(vh) << ((m.is_removed(vh)) ? " R\n" : "\n");
}
}
m.collect_garbage();
std::cout << "\nAfter garbage collection\n"
<< "# vertices / # vertices + # removed vertices = "
<< m.number_of_vertices()
<< " / " << m.number_of_vertices() + m.number_of_removed_vertices() << std::endl;
{
unsigned int i = 0, end = m.number_of_vertices() + m.number_of_removed_vertices();
for( ; i < end; ++i) {
vertex_descriptor vh(i);
std::cout << m.point(vh) << ((m.is_removed(vh)) ? " R\n" : "\n");
}
}
return 0;
}