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authorHarpreet2016-08-04 15:25:44 +0530
committerHarpreet2016-08-04 15:25:44 +0530
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+// $Id: CbcNWay.hpp 1899 2013-04-09 18:12:08Z stefan $
+// 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).
+
+// Edwin 11/9/2009-- carved out of CbcBranchActual
+
+/** Define an n-way class for variables.
+ Only valid value is one at UB others at LB
+ Normally 0-1
+*/
+#ifndef CbcNWay_H
+#define CbcNWay_H
+
+class CbcNWay : public CbcObject {
+
+public:
+
+ // Default Constructor
+ CbcNWay ();
+
+ /** Useful constructor (which are matrix indices)
+ */
+ CbcNWay (CbcModel * model, int numberMembers,
+ const int * which, int identifier);
+
+ // Copy constructor
+ CbcNWay ( const CbcNWay &);
+
+ /// Clone
+ virtual CbcObject * clone() const;
+
+ /// Assignment operator
+ CbcNWay & operator=( const CbcNWay& rhs);
+
+ /// Destructor
+ virtual ~CbcNWay ();
+
+ /// Set up a consequence for a single member
+ void setConsequence(int iColumn, const CbcConsequence & consequence);
+
+ /// Applies a consequence for a single member
+ void applyConsequence(int iSequence, int state) const;
+
+ /// Infeasibility - large is 0.5 (and 0.5 will give this)
+ virtual double infeasibility(const OsiBranchingInformation * info,
+ int &preferredWay) const;
+
+ using CbcObject::feasibleRegion ;
+ /// This looks at solution and sets bounds to contain solution
+ virtual void feasibleRegion();
+
+ /// Creates a branching object
+ virtual CbcBranchingObject * createCbcBranch(OsiSolverInterface * solver, const OsiBranchingInformation * info, int way) ;
+
+ /// Number of members
+ inline int numberMembers() const {
+ return numberMembers_;
+ }
+
+ /// Members (indices in range 0 ... numberColumns-1)
+ inline const int * members() const {
+ return members_;
+ }
+ /// Redoes data when sequence numbers change
+ virtual void redoSequenceEtc(CbcModel * model, int numberColumns, const int * originalColumns);
+
+protected:
+ /// data
+ /// Number of members
+ int numberMembers_;
+
+ /// Members (indices in range 0 ... numberColumns-1)
+ int * members_;
+ /// Consequences (normally NULL)
+ CbcConsequence ** consequence_;
+};
+/** N way branching Object class.
+ Variable is number of set.
+ */
+class CbcNWayBranchingObject : public CbcBranchingObject {
+
+public:
+
+ // Default Constructor
+ CbcNWayBranchingObject ();
+
+ /** Useful constructor - order had matrix indices
+ way_ -1 corresponds to setting first, +1 to second, +3 etc.
+ this is so -1 and +1 have similarity to normal
+ */
+ CbcNWayBranchingObject (CbcModel * model, const CbcNWay * nway,
+ int numberBranches, const int * order);
+
+ // Copy constructor
+ CbcNWayBranchingObject ( const CbcNWayBranchingObject &);
+
+ // Assignment operator
+ CbcNWayBranchingObject & operator=( const CbcNWayBranchingObject& rhs);
+
+ /// Clone
+ virtual CbcBranchingObject * clone() const;
+
+ // Destructor
+ virtual ~CbcNWayBranchingObject ();
+
+ using CbcBranchingObject::branch ;
+ /// Does next branch and updates state
+ virtual double branch();
+
+#ifdef JJF_ZERO
+ // FIXME: what do we need to do here?
+ /** Reset every information so that the branching object appears to point to
+ the previous child. This method does not need to modify anything in any
+ solver. */
+ virtual void previousBranch();
+#endif
+
+ using CbcBranchingObject::print ;
+ /** \brief Print something about branch - only if log level high
+ */
+ virtual void print();
+ /** The number of branch arms created for this branching object
+ */
+ virtual int numberBranches() const {
+ return numberInSet_;
+ }
+ /// Is this a two way object (-1 down, +1 up)
+ virtual bool twoWay() const {
+ return false;
+ }
+
+ /** Return the type (an integer identifier) of \c this */
+ virtual CbcBranchObjType type() const {
+ return NWayBranchObj;
+ }
+
+ /** Compare the original object of \c this with the original object of \c
+ brObj. Assumes that there is an ordering of the original objects.
+ This method should be invoked only if \c this and brObj are of the same
+ type.
+ Return negative/0/positive depending on whether \c this is
+ smaller/same/larger than the argument.
+ */
+ virtual int compareOriginalObject(const CbcBranchingObject* brObj) const;
+
+ /** Compare the \c this with \c brObj. \c this and \c brObj must be os the
+ same type and must have the same original object, but they may have
+ different feasible regions.
+ Return the appropriate CbcRangeCompare value (first argument being the
+ sub/superset if that's the case). In case of overlap (and if \c
+ replaceIfOverlap is true) replace the current branching object with one
+ whose feasible region is the overlap.
+ */
+ virtual CbcRangeCompare compareBranchingObject
+ (const CbcBranchingObject* brObj, const bool replaceIfOverlap = false);
+
+private:
+ /// order of branching - points back to CbcNWay
+ int * order_;
+ /// Points back to object
+ const CbcNWay * object_;
+ /// Number in set
+ int numberInSet_;
+};
+#endif