CoinPresolveFixed.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 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
 
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