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[王进 <>]

Hi,CGAL Developers:
I use Lindstrom-Turk edge-collapse algorithm for mesh simplification,but CGAL crashed at Handle_for.h  

bool
is_shared() const
   {
        return ptr_->count > 1;   
    }

because of ptr_ is invalid pointer.

the call stack show as below

CGAL::Surface_mesh_simplification::EdgeCollapse
->boost::put
->CGAL::Point_3<CGAL::Cartesian<double> >::operator=
->CGAL::PointC3<CGAL::Cartesian<double> >::operator=
->CGAL::Vector_3<CGAL::Cartesian<double> >::operator=
->CGAL::VectorC3<CGAL::Cartesian<double> >::operator=
->CGAL::Handle_for<boost::array<double,3>,std::allocator<boost::array<double,3> > >::operator=
->CGAL::Handle_for<boost::array<double,3>,std::allocator<boost::array<double,3> > >::~Handle_for
->CGAL::Handle_for<boost::array<double,3>,std::allocator<boost::array<double,3> > >::is_shared() <---crashed

for help!

Wang