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typedef struct {
    double longitude;
...
    int edge_count;
    edge_t *edges;
} polygon_t;

my $vertex1 = vertex_t->new();
my $vertex1_obj = $vertex1->_to_ptr();
...
my $edge_obj = $edge->_to_ptr();
$edge_obj->v1($vertex1);
$edge_obj->v2($vertex2);

my $polygon = polygon_t->new();
my $polygon_obj = $polygon->_to_ptr();
$polygon_obj->edge_count(8);