# CoinPresolveUseless.hpp

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    00001 /* $Id: CoinPresolveUseless.hpp 1566 2012-11-29 19:33:56Z lou $ */
    00002 // Copyright (C) 2002, International Business Machines
    00003 // Corporation and others.  All Rights Reserved.
    00004 // This code is licensed under the terms of the Eclipse Public License (EPL).
    00005
    00006 #ifndef CoinPresolveUseless_H
    00007 #define CoinPresolveUseless_H
    00008 #define USELESS         20
    00009
    00010 class useless_constraint_action : public CoinPresolveAction {
    00011   struct action {
    00012     double rlo;
    00013     double rup;
    00014     const int *rowcols;
    00015     const double *rowels;
    00016     int row;
    00017     int ninrow;
    00018   };
    00019
    00020   const int nactions_;
    00021   const action *const actions_;
    00022
    00023   useless_constraint_action(int nactions,
    00024                             const action *actions,
    00025                             const CoinPresolveAction *next);
    00026
    00027  public:
    00028   const char *name() const;
    00029
    00030   // These rows are asserted to be useless,
    00031   // that is, given a solution the row activity
    00032   // must be in range.
    00033   static const CoinPresolveAction *presolve(CoinPresolveMatrix * prob,
    00034                                          const int *useless_rows,
    00035                                          int nuseless_rows,
    00036                                          const CoinPresolveAction *next);
    00037
    00038   void postsolve(CoinPostsolveMatrix *prob) const;
    00039
    00040   virtual ~useless_constraint_action();
    00041
    00042 };
    00043
    00058 const CoinPresolveAction *testRedundant(CoinPresolveMatrix *prob,
    00059                                         const CoinPresolveAction *next) ;
    00060
    00061
    00062
    00063 #endif

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