CoinPresolveSingleton.hpp

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/* $Id: CoinPresolveSingleton.hpp 1498 2011-11-02 15:25:35Z mjs $ */
// Copyright (C) 2002, International Business Machines
// Corporation and others.  All Rights Reserved.
// This code is licensed under the terms of the Eclipse Public License (EPL).

#ifndef CoinPresolveSingleton_H
#define CoinPresolveSingleton_H
#define SLACK_DOUBLETON 2
#define SLACK_SINGLETON 8

//const int MAX_SLACK_DOUBLETONS        = 1000;

class slack_doubleton_action : public CoinPresolveAction {
  struct action {
    double clo;
    double cup;

    double rlo;
    double rup;

    double coeff;

    int col;
    int row;
  };

  const int nactions_;
  const action *const actions_;

  slack_doubleton_action(int nactions,
                         const action *actions,
                         const CoinPresolveAction *next) :
    CoinPresolveAction(next),
    nactions_(nactions),
    actions_(actions)
{}

 public:
  const char *name() const { return ("slack_doubleton_action"); }

  static const CoinPresolveAction *presolve(CoinPresolveMatrix *prob,
                                           const CoinPresolveAction *next,
                                        bool &notFinished);

  void postsolve(CoinPostsolveMatrix *prob) const;


  virtual ~slack_doubleton_action() { deleteAction(actions_,action*); }
};
class slack_singleton_action : public CoinPresolveAction {
  struct action {
    double clo;
    double cup;

    double rlo;
    double rup;

    double coeff;

    int col;
    int row;
  };

  const int nactions_;
  const action *const actions_;

  slack_singleton_action(int nactions,
                         const action *actions,
                         const CoinPresolveAction *next) :
    CoinPresolveAction(next),
    nactions_(nactions),
    actions_(actions)
{}

 public:
  const char *name() const { return ("slack_singleton_action"); }

  static const CoinPresolveAction *presolve(CoinPresolveMatrix *prob,
                                            const CoinPresolveAction *next,
                                            double * rowObjective);

  void postsolve(CoinPostsolveMatrix *prob) const;


  virtual ~slack_singleton_action() { deleteAction(actions_,action*); }
};
#endif