CoinPresolveUseless.hpp

// Copyright (C) 2002, International Business Machines
// Corporation and others.  All Rights Reserved.

#ifndef CoinPresolveUseless_H
#define CoinPresolveUseless_H
#define USELESS         20

class useless_constraint_action : public CoinPresolveAction {
  struct action {
    double rlo;
    double rup;
    const int *rowcols;
    const double *rowels;
    int row;
    int ninrow;
  };

  const int nactions_;
  const action *const actions_;

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

 public:
  const char *name() const;

  // These rows are asserted to be useless,
  // that is, given a solution the row activity
  // must be in range.
  static const CoinPresolveAction *presolve(CoinPresolveMatrix * prob,
                                         const int *useless_rows,
                                         int nuseless_rows,
                                         const CoinPresolveAction *next);

  void postsolve(CoinPostsolveMatrix *prob) const;
};


#endif

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