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CoinPresolveZeros.hpp
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1 /* $Id: CoinPresolveZeros.hpp 1498 2011-11-02 15:25:35Z mjs $ */
2 // Copyright (C) 2002, International Business Machines
3 // Corporation and others. All Rights Reserved.
4 // This code is licensed under the terms of the Eclipse Public License (EPL).
5 
6 #ifndef CoinPresolveZeros_H
7 #define CoinPresolveZeros_H
8 
14 #define DROP_ZERO 8
15 
22 struct dropped_zero {
23  int row;
24  int col;
25 };
26 
33 
34  const int nzeros_;
35  const dropped_zero *const zeros_;
36 
38  const dropped_zero *zeros,
39  const CoinPresolveAction *next) :
40  CoinPresolveAction(next),
41  nzeros_(nzeros), zeros_(zeros)
42 {}
43 
44  public:
45  const char *name() const { return ("drop_zero_coefficients_action"); }
46 
48  int *checkcols,
49  int ncheckcols,
50  const CoinPresolveAction *next);
51 
52  void postsolve(CoinPostsolveMatrix *prob) const;
53 
55 };
56 
58  const CoinPresolveAction *next);
59 
60 #endif
Abstract base class of all presolve routines.
#define deleteAction(array, type)
const CoinPresolveAction * drop_zero_coefficients(CoinPresolveMatrix *prob, const CoinPresolveAction *next)
static const CoinPresolveAction * presolve(CoinPresolveMatrix *prob, int *checkcols, int ncheckcols, const CoinPresolveAction *next)
const CoinPresolveAction * next
The next presolve transformation.
Augments CoinPrePostsolveMatrix with information about the problem that is only needed during postsol...
drop_zero_coefficients_action(int nzeros, const dropped_zero *zeros, const CoinPresolveAction *next)
Tracking information for an explicit zero coefficient.
Augments CoinPrePostsolveMatrix with information about the problem that is only needed during presolv...
void postsolve(CoinPostsolveMatrix *prob) const
Apply the postsolve transformation for this particular presolve action.
const char * name() const
A name for debug printing.
const dropped_zero *const zeros_
Removal of explicit zeros.