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#ifndef ARY_MANIP_HXX
#define ARY_MANIP_HXX

template <class XY >
class Manipulator
{
  public:
    virtual             ~Manipulator() {}

    void                operator()(
                            XY &                io_r ) const
                            { op_fcall(io_r); }
  private:
    virtual void        op_fcall(
                            XY &                io_r ) const = 0;
};

template <class XY >
class Const_Manipulator
{
  public:
    virtual             ~Const_Manipulator() {}

    void                operator()(
                            const XY &          io_r ) const
                            { op_fcall(io_r); }
  private:
    virtual void        op_fcall(
                            const XY &          io_r ) const = 0;
};


#endif