/home/coin/SVN-release/OS-2.1.0/Couenne/src/problem/depGraph/depGraph.hpp

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00001 /* $Id: depGraph.hpp 154 2009-06-16 18:52:53Z pbelotti $ */
00002 /*
00003  * Name:    depGraph.hpp
00004  * Author:  Pietro Belotti
00005  * Purpose: class for manipulating dependencies between variables
00006  *
00007  * (C) Carnegie-Mellon University, 2007. 
00008  * This file is licensed under the Common Public License (CPL)
00009  */
00010 
00011 #ifndef DEPGRAPH_HPP
00012 #define DEPGRAPH_HPP
00013 
00014 #include <vector>
00015 #include <set>
00016 
00017 #include "CouenneTypes.hpp"
00018 #include "expression.hpp"
00019 #include "exprAux.hpp"
00020 #include "CouenneProblemElem.hpp"
00021 
00022 
00024 struct compNode {
00025   inline bool operator () (const DepNode *n0, const DepNode *n1) const;
00026 };
00027 
00028 
00031 
00032 class DepNode {
00033 
00034 protected:
00035 
00037   int index_;
00038 
00041   std::set <DepNode *, compNode> *depList_;
00042 
00044   int order_;
00045 
00046 public:
00047 
00050   DepNode  (int ind):
00051     index_   (ind),
00052     depList_ (new std::set <DepNode *, compNode>),
00053     order_   (-1) {}
00054 
00056   ~DepNode () 
00057   {if (depList_) delete depList_;}
00058 
00060   inline int Index () const 
00061   {return index_;}
00062 
00064   inline int Order () const 
00065   {return order_;}
00066 
00068   inline std::set <DepNode *, compNode> *DepList () const 
00069   {return depList_;}
00070 
00072   bool depends (int xi, bool = false, 
00073                 std::set <DepNode *, compNode> *already_visited = NULL) const;
00074 
00076   void createOrder (DepGraph *);
00077 
00079   void print (int = 0, bool descend = false) const;
00080 };
00081 
00082 
00084 
00085 bool compNode::operator () (const DepNode *n0, const DepNode *n1) const
00086 {return (n0 -> Index () < n1 -> Index ());}
00087 
00088 
00091 
00092 class DepGraph {
00093 
00094 protected:
00095 
00097   std::set <DepNode *, compNode> vertices_;
00098 
00100   int counter_;
00101 
00102 public:
00103 
00105   DepGraph  (): counter_ (0) {}
00106 
00108   ~DepGraph () {
00109     for (std::set <DepNode *, compNode>::iterator i = vertices_.begin ();
00110          i != vertices_.end (); ++i) 
00111       delete (*i);
00112   }
00113 
00115   std::set <DepNode *, compNode> &Vertices () 
00116   {return vertices_;}
00117 
00119   inline int &Counter () 
00120   {return counter_;}
00121 
00123   void insert (exprVar *);
00124 
00126   void insert (exprAux *);
00127 
00129   void erase (exprVar *);
00130 
00132   bool depends (int, int, bool = false);
00133 
00135   void createOrder ();
00136 
00138   void print (bool descend = false);
00139 
00141   DepNode *lookup (int index);
00142 
00144   bool checkCycles ();
00145 };
00146 
00147 #endif

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