CoinPresolveFixed.hpp

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/* $Id: CoinPresolveFixed.hpp 1510 2011-12-08 23:56:01Z lou $ */
// 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 CoinPresolveFixed_H
#define CoinPresolveFixed_H
#define FIXED_VARIABLE  1

class remove_fixed_action : public CoinPresolveAction {
 public:
  struct action {
    int col;            
    int start;          
    double sol;         
  };
  int *colrows_;
  double *colels_;
  int nactions_;
  action *actions_;

 private:
  remove_fixed_action(int nactions,
                      action *actions,
                      double * colels,
                      int * colrows,
                      const CoinPresolveAction *next);

 public:
  const char *name() const;

  static const remove_fixed_action *presolve(CoinPresolveMatrix *prob,
                                         int *fcols,
                                         int nfcols,
                                         const CoinPresolveAction *next);

  void postsolve(CoinPostsolveMatrix *prob) const;

  virtual ~remove_fixed_action();
};


const CoinPresolveAction *remove_fixed(CoinPresolveMatrix *prob,
                                    const CoinPresolveAction *next);


class make_fixed_action : public CoinPresolveAction {

  struct action {
    double bound;       
    int col ;           
  };

  int nactions_;
  const action *actions_;

  const bool fix_to_lower_;

  const remove_fixed_action *faction_;

  make_fixed_action(int nactions, const action *actions, bool fix_to_lower,
                    const remove_fixed_action *faction,
                    const CoinPresolveAction *next)
    : CoinPresolveAction(next),
      nactions_(nactions), actions_(actions),
      fix_to_lower_(fix_to_lower),
      faction_(faction)
  {}

 public:
  const char *name() const;

  static const CoinPresolveAction *presolve(CoinPresolveMatrix *prob,
                                         int *fcols,
                                         int nfcols,
                                         bool fix_to_lower,
                                         const CoinPresolveAction *next);

  void postsolve(CoinPostsolveMatrix *prob) const;

  virtual ~make_fixed_action() {
    deleteAction(actions_,action*); 
    delete faction_;
  }
};

const CoinPresolveAction *make_fixed(CoinPresolveMatrix *prob,
                                    const CoinPresolveAction *next) ;

void transferCosts(CoinPresolveMatrix * prob);
#endif