/* $Id: CbcFeasibilityBase.hpp 1573 2011-01-05 01:12:36Z lou $ */
// Copyright (C) 2005, International Business Machines
// Corporation and others.  All Rights Reserved.
// This code is licensed under the terms of the Eclipse Public License (EPL).

#ifndef CbcFeasibilityBase_H
#define CbcFeasibilityBase_H


//#############################################################################
/*  There are cases where the user wants to control how CBC sees the problems feasibility.
    The user may want to examine the problem and say :
    a) The default looks OK
    b) Pretend this problem is Integer feasible
    c) Pretend this problem is infeasible even though it looks feasible

    This simple class allows user to do that.

*/

class CbcModel;
class CbcFeasibilityBase {
public:
    // Default Constructor
    CbcFeasibilityBase () {}

    /**
       On input mode:
       0 - called after a solve but before any cuts
       -1 - called after strong branching
       Returns :
       0 - no opinion
       -1 pretend infeasible
       1 pretend integer solution
    */
    virtual int feasible(CbcModel * , int ) {
        return 0;
    }

    virtual ~CbcFeasibilityBase() {}

    // Copy constructor
    CbcFeasibilityBase ( const CbcFeasibilityBase & ) {}

    // Assignment operator
    CbcFeasibilityBase & operator=( const CbcFeasibilityBase& ) {
        return *this;
    }

    /// Clone
    virtual CbcFeasibilityBase * clone() const {
        return new CbcFeasibilityBase(*this);
    }
};
#endif