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-/* $Id: CoinPresolveImpliedFree.hpp 1694 2014-04-29 02:08:35Z tkr $ */
-// 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 CoinPresolveImpliedFree_H
-#define CoinPresolveImpliedFree_H
-
-/*!
- \file
-*/
-
-#define IMPLIED_FREE 9
-
-/*! \class implied_free_action
- \brief Detect and process implied free variables
-
- Consider a singleton variable x (<i>i.e.</i>, a variable involved in only
- one constraint). Suppose that the bounds on that constraint, combined with
- the bounds on the other variables involved in the constraint, are such that
- even the worst case values of the other variables still imply bounds for x
- which are tighter than the variable's original bounds. Since x can never
- reach its upper or lower bounds, it is an implied free variable. Both x and
- the constraint can be deleted from the problem.
-
- A similar transform for the case where the variable is not a natural column
- singleton is handled by #subst_constraint_action.
-*/
-class implied_free_action : public CoinPresolveAction {
- struct action {
- int row, col;
- double clo, cup;
- double rlo, rup;
- const double *rowels;
- const double *costs;
- int ninrow;
- };
-
- const int nactions_;
- const action *const actions_;
-
- implied_free_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,
- int & fillLevel);
-
- void postsolve(CoinPostsolveMatrix *prob) const;
-
- virtual ~implied_free_action();
-};
-
-#endif