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// { dg-do compile }

namespace internal {

    template < class DSC, bool Const >   struct CC_iterator   {

        typedef CC_iterator iterator;

        typedef typename DSC::value_type value_type;

        typedef const value_type* pointer;

        CC_iterator ()     ;

        CC_iterator (const iterator &it)     {

        }

        pointer p;

        pointer operator->() const ;

    };

}

template < class T > struct Compact_container {

    typedef Compact_container  Self;

    typedef T value_type;

    typedef internal::CC_iterator iterator;

};

template < typename TDS = void > struct Periodic_3_triangulation_ds_cell_base_3 {

    typedef typename TDS::Vertex_handle Vertex_handle;

    const Vertex_handle& vertex(int i) const   {

    }

};

struct Triangulation_data_structure_3    {

    typedef Triangulation_data_structure_3 Tds;

    typedef Periodic_3_triangulation_ds_cell_base_3 Cell;

    typedef Compact_container Cell_range;

    typedef Compact_container Vertex_range;

    typedef typename Cell_range::iterator Cell_handle;

    typedef typename Vertex_range::iterator Vertex_handle;

};

typedef Triangulation_data_structure_3 TDS1;

template <  class > struct Periodic_3_Delaunay_triangulation_3 {

    typedef TDS1::Vertex_handle Vertex_handle;

    typedef TDS1::Cell_handle Cell_handle;

    int compare_distance() const {

    }

    Vertex_handle nearest_vertex() const;

};

template < class Tds > typename Periodic_3_Delaunay_triangulation_3::Vertex_handle Periodic_3_Delaunay_triangulation_3::nearest_vertex() const {

    Cell_handle c ;

    Vertex_handle nearest = c->vertex(0);

    nearest = (compare_distance() == -1) ?       nearest : c->vertex(0);

    return nearest;

}

typedef Periodic_3_Delaunay_triangulation_3 PDT1;

struct Periodic_3_triangulation_hierarchy_3   : PDT1 {

    Vertex_handle   nearest_vertex() const;

};

Periodic_3_triangulation_hierarchy_3::Vertex_handle Periodic_3_triangulation_hierarchy_3:: nearest_vertex() const {

    return PDT1::nearest_vertex();

}