/* -*- C++ -*-

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

 *

 * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Combinatorial Optimization Research Group, 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_BASE_H

#define LEMON_LP_BASE_H

///\file

///\brief The interface of the LP solver interface.

namespace lemon {

  class LpSolverBase {

  public:

    //UNCATEGORIZED

    /// \e

    typedef double Value;

    /// \e 

    static const Value INF;

   protected:

    //MATRIX MANIPULATING FUNCTIONS

    /// \e

    virtual int _addCol() = 0;

    /// \e

    virtual int _addRow() = 0;

    /// \e

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

    virtual void _setRowCoeffs(int i, 

                               int  const * indices, 

                               Value  const * values ) = 0;

    /// \e

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

    virtual void _setColCoeffs(int i, 

                               int  const * indices, 

                               Value  const * values ) = 0;

    /// \e

    /// 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 -INF.

    virtual void _setColLowerBound(int i, Value value) = 0;

    /// \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 INF.

    virtual void _setColUpperBound(int i, Value value) = 0;

    /// \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 -INF.

    virtual void _setRowLowerBound(int i, Value value) = 0;

    /// \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 INF.

    virtual void _setRowUpperBound(int i, Value value) = 0;

    /// \e

    virtual void _setObjCoeff(int i, Value obj_coef) = 0;

  };  

} //namespace lemon

#endif //LEMON_LP_BASE_H