CoinPresolveUseless.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 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);
 
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;
 
  virtual ~useless_constraint_action();
};
 
const CoinPresolveAction *testRedundant(CoinPresolveMatrix *prob,
  const CoinPresolveAction *next);
 
#endif
 
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