CoinPresolveSingleton.hpp

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/* $Id$ */
// 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
 
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