Please help with these two errors

[mahmoodn <nt_mahmood at yahoo dot com>]

Hi,
I have defined a class named "vertex_feature_2":

class Vertex_feature_2
{
public:
    enum Type
    {
      CIRCULAR,
      CHAIN
    };

private:
    int                     ver_id;   // The ID of the coresponding vertex.
public:
    /*!
     * Default constrcutor.
     */
    Vertex_feature_2 () :
      ver_id (-1)
    {}

    /*!
     * Destructor.
     */
    virtual ~Vertex_feature_2 ()
    {}

    /*!
     * Get the feature type.
     */
    virtual Vertex_feature_2::Type type () const = 0;  // ERROR1&-(

   
and also there is a class "circular_arc_2" that is derived from
"vertex_feature_2":
   
class Circular_arc_2 : public Vertex_feature_2
{
    virtual typename Vertex_feature_2::Type type () const
    {
      return (CIRCULAR);  //ERROR2&-(
    }
}

there are two problems:confused::confused::
error: `Type' declared as a `virtual' field
error: `CIRCULAR' was not declared in this scope

how can I resolve them?:working:
Thanks,
 

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