// Copyright (C) 2003, International Business Machines
// Corporation and others.  All Rights Reserved.
#ifndef ClpPdcoBase_H
#define ClpPdcoBase_H

#include "CoinPragma.hpp"

#include "CoinPackedMatrix.hpp"
#include "CoinDenseVector.hpp"
class ClpInterior;

/** Abstract base class for tailoring everything for Pcdo

    Since this class is abstract, no object of this type can be created.

    If a derived class provides all methods then all ClpPcdo algorithms
    should work. 

    Eventually we should be able to use ClpObjective and ClpMatrixBase.
*/

class ClpPdcoBase  {
  
public:
   /**@name Virtual methods that the derived classes must provide */
   //@{
  virtual void matVecMult(ClpInterior * model, int mode, double * x, double * y) const=0;
  
  virtual void getGrad(ClpInterior * model, CoinDenseVector<double> &x, CoinDenseVector<double> &grad) const=0;
  
  virtual void getHessian(ClpInterior * model, CoinDenseVector<double> &x, CoinDenseVector<double> &H) const=0;
  
  virtual double getObj(ClpInterior * model, CoinDenseVector<double> &x) const=0;
  
  virtual void matPrecon(ClpInterior * model,  double delta, double * x, double * y) const = 0;
  
  //@}
  //@{
  ///@name Other
  /// Clone
  virtual ClpPdcoBase * clone() const = 0;
  /// Returns type
  inline int type() const
  { return type_;};
  /// Sets type
  inline void setType(int type) {type_=type;};
  /// Returns size of d1
  inline int sizeD1() const
  { return 1;};
  /// Returns d1 as scalar
  inline double getD1() const
  { return d1_;};
  /// Returns size of d2
  inline int sizeD2() const
  { return 1;};
  /// Returns d2 as scalar
  inline double getD2() const
  { return d2_;};
   //@}
  
  
protected:

   /**@name Constructors, destructor<br>
      <strong>NOTE</strong>: All constructors are protected. There's no need
      to expose them, after all, this is an abstract class. */
   //@{
   /** Default constructor. */
   ClpPdcoBase();
   /** Destructor (has to be public) */
public:
   virtual ~ClpPdcoBase();
protected:
  // Copy
   ClpPdcoBase(const ClpPdcoBase&);
  // Assignment
   ClpPdcoBase& operator=(const ClpPdcoBase&);
   //@}
   
    
protected:
   /**@name Data members
      The data members are protected to allow access for derived classes. */
   //@{
  /// Should be dense vectors
  double d1_;
  double d2_;
   /// type (may be useful)
   int type_;
   //@}
};

#endif