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/* $Id: CoinPresolveTighten.hpp 1498 2011-11-02 15:25:35Z mjs $ */
// 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 CoinPresolveTighten_H
#define CoinPresolveTighten_H
#include "CoinPresolveMatrix.hpp"
// This action has no separate class;
// instead, it decides which columns can be made fixed
// and calls make_fixed_action::presolve.
const CoinPresolveAction *tighten_zero_cost(CoinPresolveMatrix *prob,
const CoinPresolveAction *next);
#define DO_TIGHTEN 30
class do_tighten_action : public CoinPresolveAction {
do_tighten_action();
do_tighten_action(const do_tighten_action& rhs);
do_tighten_action& operator=(const do_tighten_action& rhs);
struct action {
int *rows;
double *lbound;
double *ubound;
int col;
int nrows;
int direction; // just for assertions
};
const int nactions_;
const action *const actions_;
do_tighten_action(int nactions,
const action *actions,
const CoinPresolveAction *next) :
CoinPresolveAction(next),
nactions_(nactions), actions_(actions) {}
public:
const char *name() const;
static const CoinPresolveAction *presolve(CoinPresolveMatrix *prob,
const CoinPresolveAction *next);
void postsolve(CoinPostsolveMatrix *prob) const;
virtual ~do_tighten_action();
};
#endif
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