/* -*- C++ -*-

 * lemon/lp_skeleton.h - Part of LEMON, a generic C++ optimization library

 *

 * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */

#ifndef LEMON_LP_SKELETON

#define LEMON_LP_SKELETON

#include <lemon/lp_base.h>

///\file

///\brief A skeleton file to implement LP solver interfaces

namespace lemon {

  ///A skeleton class to implement LP solver interfaces

  class LpSkeleton :public LpSolverBase {

    int col_num,row_num;

  protected:

    ///\e

    virtual LpSolverBase &_newLp();

    ///\e

    virtual LpSolverBase &_copyLp();

    /// \e

    virtual int _addCol();

    /// \e

    virtual int _addRow();

    /// \e

    virtual void _eraseCol(int i);

    /// \e

    virtual void _eraseRow(int i);

    /// \e

    /// \warning Arrays are indexed from 1 (datum at index 0 is ignored)

    ///

    virtual void _setRowCoeffs(int i, 

			       int length,

                               int  const * indices, 

                               Value  const * values );

    /// \e

    /// \warning Arrays are indexed from 1 (datum at index 0 is ignored)

    ///

    virtual void _setColCoeffs(int i, 

			       int length,

                               int  const * indices, 

                               Value  const * values );

    /// Set one element of the coefficient matrix

    virtual void _setCoeff(int row, int col, Value value);

    /// The lower bound of a variable (column) have to be given by an 

    /// extended number of type Value, i.e. a finite number of type 

    /// Value or -\ref INF.

    virtual void _setColLowerBound(int i, Value value);

    /// \e

    /// The upper bound of a variable (column) have to be given by an 

    /// extended number of type Value, i.e. a finite number of type 

    /// Value or \ref INF.

    virtual void _setColUpperBound(int i, Value value);

    /// \e

//     /// The lower bound of a linear expression (row) have to be given by an 

//     /// extended number of type Value, i.e. a finite number of type 

//     /// Value or -\ref INF.

//     virtual void _setRowLowerBound(int i, Value value);

//     /// \e

//     /// The upper bound of a linear expression (row) have to be given by an 

//     /// extended number of type Value, i.e. a finite number of type 

//     /// Value or \ref INF.

//     virtual void _setRowUpperBound(int i, Value value);

    /// The lower and upper bound of a linear expression (row) have to be 

    /// given by an 

    /// extended number of type Value, i.e. a finite number of type 

    /// Value or +/-\ref INF.

    virtual void _setRowBounds(int i, Value lb, Value ub);

    /// \e

    /// \e

    virtual void _clearObj();

    /// \e

    virtual void _setObjCoeff(int i, Value obj_coef);

    ///\e

    ///\bug Wrong interface

    ///

    virtual SolveExitStatus _solve();

    ///\e

    ///\bug Wrong interface

    ///

    virtual Value _getPrimal(int i);

    ///\e

    ///\bug Wrong interface

    ///

    virtual Value _getPrimalValue();

    ///\e

    ///\bug Wrong interface

    ///

    virtual SolutionStatus _getPrimalStatus();

    ///\e

    virtual void _setMax();

    ///\e

    virtual void _setMin();

  public:

    LpSkeleton() : LpSolverBase(), col_num(0), row_num(0) {}

  };  

} //namespace lemon

#endif // LEMON_LP_SKELETON