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+// $Id: CbcNodeInfo.hpp 2048 2014-07-16 09:29:16Z forrest $
+// 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 11/24/09 carved from CbcNode
+
+#ifndef CbcNodeInfo_H
+#define CbcNodeInfo_H
+
+#include <string>
+#include <vector>
+
+#include "CoinWarmStartBasis.hpp"
+#include "CoinSearchTree.hpp"
+#include "CbcBranchBase.hpp"
+
+class OsiSolverInterface;
+class OsiSolverBranch;
+
+class OsiCuts;
+class OsiRowCut;
+class OsiRowCutDebugger;
+class CoinWarmStartBasis;
+class CbcCountRowCut;
+class CbcModel;
+class CbcNode;
+class CbcSubProblem;
+class CbcGeneralBranchingObject;
+
+//#############################################################################
+/** Information required to recreate the subproblem at this node
+
+  When a subproblem is initially created, it is represented by a CbcNode
+  object and an attached CbcNodeInfo object.
+
+  The CbcNode contains information needed while the subproblem remains live.
+  The CbcNode is deleted when the last branch arm has been evaluated.
+
+  The CbcNodeInfo contains information required to maintain the branch-and-cut
+  search tree structure (links and reference counts) and to recreate the
+  subproblem for this node (basis, variable bounds, cutting planes). A
+  CbcNodeInfo object remains in existence until all nodes have been pruned from
+  the subtree rooted at this node.
+
+  The principle used to maintain the reference count is that the reference
+  count is always the sum of all potential and actual children of the node.
+  Specifically,
+  <ul>
+    <li> Once it's determined how the node will branch, the reference count
+	 is set to the number of potential children (<i>i.e.</i>, the number
+	 of arms of the branch).
+    <li> As each child is created by CbcNode::branch() (converting a potential
+	 child to the active subproblem), the reference count is decremented.
+    <li> If the child survives and will become a node in the search tree
+	 (converting the active subproblem into an actual child), increment the
+	 reference count.
+  </ul>
+  Notice that the active subproblem lives in a sort of limbo, neither a
+  potential or an actual node in the branch-and-cut tree.
+
+  CbcNodeInfo objects come in two flavours. A CbcFullNodeInfo object contains
+  a full record of the information required to recreate a subproblem.
+  A CbcPartialNodeInfo object expresses this information in terms of
+  differences from the parent.
+*/
+
+class CbcNodeInfo {
+
+public:
+
+    /** \name Constructors & destructors */
+//@{
+    /** Default Constructor
+
+      Creates an empty NodeInfo object.
+    */
+    CbcNodeInfo ();
+
+    /// Copy constructor
+    CbcNodeInfo ( const CbcNodeInfo &);
+
+#ifdef JJF_ZERO
+    /** Construct with parent
+
+      Creates a NodeInfo object which knows its parent and assumes it will
+      in turn have two children.
+    */
+    CbcNodeInfo (CbcNodeInfo * parent);
+#endif
+
+    /** Construct with parent and owner
+
+      As for `construct with parent', and attached to \p owner.
+    */
+    CbcNodeInfo (CbcNodeInfo * parent, CbcNode * owner);
+
+    /** Destructor
+
+      Note that the destructor will recursively delete the parent if this
+      nodeInfo is the last child.
+    */
+    virtual ~CbcNodeInfo();
+//@}
+
+
+    /** \brief Modify model according to information at node
+
+        The routine modifies the model according to bound and basis
+        information at node and adds any cuts to the addCuts array.
+    */
+    virtual void applyToModel (CbcModel *model, CoinWarmStartBasis *&basis,
+                               CbcCountRowCut **addCuts,
+                               int &currentNumberCuts) const = 0 ;
+    /// Just apply bounds to one variable - force means overwrite by lower,upper (1=>infeasible)
+    virtual int applyBounds(int iColumn, double & lower, double & upper, int force) = 0;
+
+    /** Builds up row basis backwards (until original model).
+        Returns NULL or previous one to apply .
+        Depends on Free being 0 and impossible for cuts
+    */
+    virtual CbcNodeInfo * buildRowBasis(CoinWarmStartBasis & basis) const = 0;
+    /// Clone
+    virtual CbcNodeInfo * clone() const = 0;
+    /// Called when number branches left down to zero
+    virtual void allBranchesGone() {}
+#ifndef JJF_ONE
+    /// Increment number of references
+    inline void increment(int amount = 1) {
+        numberPointingToThis_ += amount;/*printf("CbcNodeInfo %x incremented by %d to %d\n",this,amount,numberPointingToThis_);*/
+    }
+
+    /// Decrement number of references and return number left
+    inline int decrement(int amount = 1) {
+        numberPointingToThis_ -= amount;/*printf("CbcNodeInfo %x decremented by %d to %d\n",this,amount,numberPointingToThis_);*/
+        return numberPointingToThis_;
+    }
+#else
+    /// Increment number of references
+    void increment(int amount = 1);
+    /// Decrement number of references and return number left
+    int decrement(int amount = 1);
+#endif
+    /** Initialize reference counts
+
+      Initialize the reference counts used for tree maintenance.
+    */
+
+    inline void initializeInfo(int number) {
+        numberPointingToThis_ = number;
+        numberBranchesLeft_ = number;
+    }
+
+    /// Return number of branches left in object
+    inline int numberBranchesLeft() const {
+        return numberBranchesLeft_;
+    }
+
+    /// Set number of branches left in object
+    inline void setNumberBranchesLeft(int value) {
+        numberBranchesLeft_ = value;
+    }
+
+    /// Return number of objects pointing to this
+    inline int numberPointingToThis() const {
+        return numberPointingToThis_;
+    }
+
+    /// Set number of objects pointing to this
+    inline void setNumberPointingToThis(int number) {
+        numberPointingToThis_ = number;
+    }
+
+    /// Increment number of objects pointing to this
+    inline void incrementNumberPointingToThis() {
+        numberPointingToThis_ ++;
+    }
+
+    /// Say one branch taken
+    inline int branchedOn() {
+        numberPointingToThis_--;
+        numberBranchesLeft_--;
+        return numberBranchesLeft_;
+    }
+
+    /// Say thrown away
+    inline void throwAway() {
+        numberPointingToThis_ -= numberBranchesLeft_;
+        numberBranchesLeft_ = 0;
+    }
+
+    /// Parent of this
+    CbcNodeInfo * parent() const {
+        return parent_;
+    }
+    /// Set parent null
+    inline void nullParent() {
+        parent_ = NULL;
+    }
+
+    void addCuts(OsiCuts & cuts, int numberToBranch, //int * whichGenerator,
+                 int numberPointingToThis);
+    void addCuts(int numberCuts, CbcCountRowCut ** cuts, int numberToBranch);
+    /** Delete cuts (decrements counts)
+        Slow unless cuts in same order as saved
+    */
+    void deleteCuts(int numberToDelete, CbcCountRowCut ** cuts);
+    void deleteCuts(int numberToDelete, int * which);
+
+    /// Really delete a cut
+    void deleteCut(int whichOne);
+
+    /// Decrement active cut counts
+    void decrementCuts(int change = 1);
+
+    /// Increment active cut counts
+    void incrementCuts(int change = 1);
+
+    /// Decrement all active cut counts in chain starting at parent
+    void decrementParentCuts(CbcModel * model, int change = 1);
+
+    /// Increment all active cut counts in parent chain
+    void incrementParentCuts(CbcModel * model, int change = 1);
+
+    /// Array of pointers to cuts
+    inline CbcCountRowCut ** cuts() const {
+        return cuts_;
+    }
+
+    /// Number of row cuts (this node)
+    inline int numberCuts() const {
+        return numberCuts_;
+    }
+    inline void setNumberCuts(int value) {
+        numberCuts_ = value;
+    }
+
+    /// Set owner null
+    inline void nullOwner() {
+        owner_ = NULL;
+    }
+    const inline CbcNode * owner() const {
+        return owner_;
+    }
+    inline CbcNode * mutableOwner() const {
+        return owner_;
+    }
+    /// The node number
+    inline int nodeNumber() const {
+        return nodeNumber_;
+    }
+    inline void setNodeNumber(int node) {
+        nodeNumber_ = node;
+    }
+    /** Deactivate node information.
+        1 - bounds
+        2 - cuts
+        4 - basis!
+	8 - just marked
+	16 - symmetry branching worked
+    */
+    void deactivate(int mode = 3);
+    /// Say if normal
+    inline bool allActivated() const {
+        return ((active_&7) == 7);
+    }
+    /// Say if marked
+    inline bool marked() const {
+        return ((active_&8) != 0);
+    }
+    /// Mark
+    inline void mark() {
+        active_ |= 8;
+    }
+    /// Unmark
+    inline void unmark() {
+        active_ &= ~8;
+    }
+    /// Get symmetry value (true worked at this node)
+    inline bool symmetryWorked() const
+    { return (active_&16) !=0;}
+    /// Say symmetry worked at this node)
+    inline void setSymmetryWorked()
+    { active_ |= 16;}
+
+    /// Branching object for the parent
+    inline const OsiBranchingObject * parentBranch() const {
+        return parentBranch_;
+    }
+    /// If we need to take off parent based data
+    void unsetParentBasedData();
+protected:
+
+    /** Number of other nodes pointing to this node.
+
+      Number of existing and potential search tree nodes pointing to this node.
+      `Existing' means referenced by #parent_ of some other CbcNodeInfo.
+      `Potential' means children still to be created (#numberBranchesLeft_ of
+      this CbcNodeInfo).
+    */
+    int numberPointingToThis_;
+
+    /// parent
+    CbcNodeInfo * parent_;
+
+    /// Copy of the branching object of the parent when the node is created
+    OsiBranchingObject * parentBranch_;
+
+    /// Owner
+    CbcNode * owner_;
+
+    /// Number of row cuts (this node)
+    int numberCuts_;
+
+    /// The node number
+    int nodeNumber_;
+
+    /// Array of pointers to cuts
+    CbcCountRowCut ** cuts_;
+
+    /** Number of rows in problem (before these cuts).  This
+        means that for top of chain it must be rows at continuous */
+    int numberRows_;
+
+    /** Number of branch arms left to explore at this node
+
+      \todo There seems to be redundancy between this field and
+        CbcBranchingObject::numberBranchesLeft_. It'd be good to sort out if
+        both are necessary.
+    */
+    int numberBranchesLeft_;
+    /** Active node information.
+        1 - bounds
+        2 - cuts
+        4 - basis!
+    */
+    int active_;
+
+private:
+
+    /// Illegal Assignment operator
+    CbcNodeInfo & operator=(const CbcNodeInfo& rhs);
+
+    /// routine common to constructors
+    void setParentBasedData();
+};
+
+#endif // CbcNodeInfo_H
+