# HG changeset patch
# User jacint
# Date 1082747045 0
# Node ID d7ebbae96025333299c3fbba35564809e8c230f3
# Parent  f27d21767d38c12eded4728d7a17e14a371044fb
Some changes in the documentation.

diff -r f27d21767d38 -r d7ebbae96025 src/include/dijkstra.h
--- a/src/include/dijkstra.h	Fri Apr 23 18:48:56 2004 +0000
+++ b/src/include/dijkstra.h	Fri Apr 23 19:04:05 2004 +0000
@@ -1,17 +1,15 @@
 // -*- C++ -*-
-
 #ifndef HUGO_DIJKSTRA_H
 #define HUGO_DIJKSTRA_H
 
 ///\file
 ///\brief Dijkstra algorithm.
 
-#include <fib_heap.h>
 #include <bin_heap.h>
 #include <invalid.h>
 
 namespace hugo {
-  
+
   ///%Dijkstra algorithm class.
 
   ///This class provides an efficient implementation of %Dijkstra algorithm.
@@ -23,14 +21,17 @@
   ///
   ///It is also possible to change the underlying priority heap.
   ///
-  ///\param Graph The graph type the algorithm runs on.  
-  ///\param LengthMap This read-only EdgeMap determines the lengths of
-  ///the edges. It is read once for each edge, so the map may involve
-  ///in relatively time consuming process to compute the edge length
-  ///if it is necessary. The default map type is \ref
-  ///GraphSkeleton::EdgeMap "Graph::EdgeMap<int>"
-  ///\param Heap The heap type used by the %Dijkstra algorithm. The
-  ///default is using \ref BinHeap "binary heap".
+  ///\param Graph The graph type the algorithm runs on.
+  ///\param LengthMap This read-only
+  ///EdgeMap
+  ///determines the
+  ///lengths of the edges. It is read once for each edge, so the map
+  ///may involve in relatively time consuming process to compute the edge
+  ///length if it is necessary. The default map type is
+  ///\ref GraphSkeleton::EdgeMap "Graph::EdgeMap<int>"
+  ///\param Heap The heap type used by the %Dijkstra
+  ///algorithm. The default
+  ///is using \ref BinHeap "binary heap".
   
 #ifdef DOXYGEN
   template <typename Graph,
@@ -67,56 +68,61 @@
     
     void run(Node s);
     
-    ///The distance of a node from the source.
+    ///The distance of a node from the root.
 
-    ///Returns the distance of a node from the source.
+    ///Returns the distance of a node from the root.
     ///\pre \ref run() must be called before using this function.
-    ///\warning If node \c v in unreachable from the source the return value
+    ///\warning If node \c v in unreachable from the root the return value
     ///of this funcion is undefined.
     ValueType dist(Node v) const { return distance[v]; }
 
-    ///Returns the edges of the shortest path tree.
+    ///Returns the previous edge of the shortest path tree.
 
-    ///For a node \c v it returns the last edge of the shortest path
-    ///from the source to \c v or INVALID if \c v is unreachable
-    ///from the source.
-    ///\pre \ref run() must be called before using this function.
+    ///For a node \c v it returns the previous edge of the shortest path tree,
+    ///i.e. it returns the last edge from a shortest path from the root to \c
+    ///v. It is INVALID if \c v is unreachable from the root or if \c v=s. The
+    ///shortest path tree used here is equal to the shortest path tree used in
+    ///\ref predNode(Node v).  \pre \ref run() must be called before using
+    ///this function.
     Edge pred(Node v) const { return predecessor[v]; }
 
-    ///Returns the nodes of the shortest paths.
+    ///Returns the previous node of the shortest path tree.
 
-    ///For a node \c v it returns the last but one node of the shortest path
-    ///from the source to \c v or INVALID if \c v is unreachable
-    ///from the source.
-    ///\pre \ref run() must be called before using this function.
+    ///For a node \c v it returns the previous node of the shortest path tree,
+    ///i.e. it returns the last but one node from a shortest path from the
+    ///root to \c /v. It is INVALID if \c v is unreachable from the root or if
+    ///\c v=s. The shortest path tree used here is equal to the shortest path
+    ///tree used in \ref pred(Node v).  \pre \ref run() must be called before
+    ///using this function.
     Node predNode(Node v) const { return pred_node[v]; }
     
     ///Returns a reference to the NodeMap of distances.
 
-    ///\pre \ref run() must be called before using this function.
-    ///
+    ///Returns a reference to the NodeMap of distances. \pre \ref run() must
+    ///be called before using this function.
     const DistMap &distMap() const { return distance;}
-    
+ 
     ///Returns a reference to the shortest path tree map.
 
     ///Returns a reference to the NodeMap of the edges of the
     ///shortest path tree.
     ///\pre \ref run() must be called before using this function.
     const PredMap &predMap() const { return predecessor;}
-    
-    ///Returns a reference to the map of nodes of  shortest paths.
+ 
+    ///Returns a reference to the map of nodes of shortest paths.
 
     ///Returns a reference to the NodeMap of the last but one nodes of the
-    ///shortest paths.
+    ///shortest path tree.
     ///\pre \ref run() must be called before using this function.
     const PredNodeMap &predNodeMap() const { return pred_node;}
 
-    ///Checks if a node is reachable from the source.
+    ///Checks if a node is reachable from the root.
 
-    ///Returns \c true if \c v is reachable from the source.
-    ///\warning the source node is reported to be unreached!
+    ///Returns \c true if \c v is reachable from the root.
+    ///\warning the root node is reported to be unreached!
     ///\todo Is this what we want?
     ///\pre \ref run() must be called before using this function.
+    ///
     bool reached(Node v) { return G.valid(predecessor[v]); }
     
   };
@@ -126,12 +132,14 @@
   //  IMPLEMENTATIONS
   // **********************************************************************
 
-  ///Runs %Dijkstra algorithm from source node \c s.
+  ///Runs %Dijkstra algorithm from node the root.
 
-  ///This method runs the %Dijkstra algorithm from a source node \c s
-  ///in order to compute the shortest path to each node. The algorithm
-  ///computes - The shortest path tree.  - The distance of each node
-  ///from the source.
+  ///This method runs the %Dijkstra algorithm from a root node \c s
+  ///in order to
+  ///compute the
+  ///shortest path to each node. The algorithm computes
+  ///- The shortest path tree.
+  ///- The distance of each node from the root.
   template <typename Graph, typename LengthMap,
 	    template<class,class,class> class Heap >
   void Dijkstra<Graph,LengthMap,Heap>::run(Node s) {
@@ -145,18 +153,20 @@
     typename Graph::NodeMap<int> heap_map(G,-1);
     
     Heap<Node,ValueType,typename Graph::NodeMap<int> > heap(heap_map);
+    
     heap.push(s,0); 
     
-    while ( !heap.empty() ) {
-      
-      Node v=heap.top(); 
-      ValueType oldvalue=heap[v];
-      heap.pop();
-      distance.set(v, oldvalue);
+      while ( !heap.empty() ) {
 	
-      { //FIXME this bracket is for e to be local
-	OutEdgeIt e;
-	for(G.first(e, v); G.valid(e); G.next(e)) {
+	Node v=heap.top(); 
+	ValueType oldvalue=heap[v];
+	heap.pop();
+	distance.set(v, oldvalue);
+	
+	{ //FIXME this bracket is for e to be local
+	  OutEdgeIt e;
+	for(G.first(e, v);
+	    G.valid(e); G.next(e)) {
 	  Node w=G.head(e); 
 	  
 	  switch(heap.state(w)) {
@@ -176,8 +186,8 @@
 	    break;
 	  }
 	}
-      } //FIXME this bracket
-    }
+      } //FIXME tis bracket
+      }
   }
   
 } //END OF NAMESPACE HUGO