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Hi,

I am a newbie to CGAL. I was writing a code to access OFF files. I am not able
to access the properties of mesh. Could some one please point out where I am
making the mistake. 

#include <CGAL/Simple_cartesian.h>
#include <CGAL/Polyhedron_3.h>
#include <CGAL/IO/Polyhedron_iostream.h>

#include <iostream>
#include <istream>
#include <fstream>

typedef CGAL::Simple_cartesian<double> Kernel;
typedef CGAL::Polyhedron_3<Kernel>     Polyhedron;

int main() {
    std::ifstream stream("test.off");
    Polyhedron P;
    stream >> P;
    std::cout << "\n "<<P.size_of_vertices();
    return 0;
}



I even used the following code snippet but still not able to fetch the mesh in
<Polyhedron>P (no ERRORS were thrown).

        istream*     p_in = &cin;
        ifstream     in;
        in.open("test.off");
        p_in = &in;
        if ( !in) 
        {
                cerr << "ERROR: cannot open file for reading.";
                exit( 1);
        }
        
        if ( !(*p_in)) {
                cerr << "ERROR: file not in OFF format or error while 
reading";
                exit( 1);
        }

        Polyhedron P;
        (*p_in) >> P;