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# /home/coin/svn-release/Alps-1.5.0/Osi/src/Osi/OsiPresolve.hpp

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    00001 // Copyright (C) 2003, International Business Machines
    00002 // Corporation and others.  All Rights Reserved.
    00003 // This code is licensed under the terms of the Eclipse Public License (EPL).
    00004
    00005 #ifndef OsiPresolve_H
    00006 #define OsiPresolve_H
    00007 #include "OsiSolverInterface.hpp"
    00008
    00009 class CoinPresolveAction;
    00010 #include "CoinPresolveMatrix.hpp"
    00011
    00012
    00062 class OsiPresolve {
    00063 public:
    00065   OsiPresolve();
    00066
    00068   virtual ~OsiPresolve();
    00069
    00090   virtual OsiSolverInterface *presolvedModel(OsiSolverInterface & origModel,
    00091                                              double feasibilityTolerance=0.0,
    00092                                              bool keepIntegers=true,
    00093                                              int numberPasses=5,
    00094                                              const char * prohibited=NULL,
    00095                                              bool doStatus=true,
    00096                                              const char * rowProhibited=NULL);
    00097
    00115   virtual void postsolve(bool updateStatus=true);
    00116
    00118   OsiSolverInterface * model() const;
    00119
    00121   OsiSolverInterface * originalModel() const;
    00122
    00124   void setOriginalModel(OsiSolverInterface *model);
    00125
    00127   const int * originalColumns() const;
    00128
    00130   const int * originalRows() const;
    00131
    00133   inline int getNumRows() const
    00134   { return nrows_;}
    00135
    00137   inline int getNumCols() const
    00138   { return ncols_;}
    00139
    00144   inline void setNonLinearValue(double value)
    00145   { nonLinearValue_ = value;}
    00146   inline double nonLinearValue() const
    00147     { return nonLinearValue_;}
    00166   inline void setPresolveActions(int action)
    00167   { presolveActions_  = (presolveActions_&0xffff0000)|(action&0xffff);}
    00168
    00169 private:
    00174   OsiSolverInterface * originalModel_;
    00175
    00180   OsiSolverInterface * presolvedModel_;
    00181
    00187   double nonLinearValue_;
    00188
    00190   int * originalColumn_;
    00191
    00193   int * originalRow_;
    00194
    00196   const CoinPresolveAction *paction_;
    00197
    00204   int ncols_;
    00205
    00207   int nrows_;
    00208
    00210   CoinBigIndex nelems_;
    00211
    00217   int presolveActions_;
    00219   int numberPasses_;
    00220
    00221 protected:
    00230   virtual const CoinPresolveAction *presolve(CoinPresolveMatrix *prob);
    00231
    00242   virtual void postsolve(CoinPostsolveMatrix &prob);
    00243
    00250   void gutsOfDestroy();
    00251 };
    00252 #endif