# HG changeset patch
# User deba
# Date 1096389655 0
# Node ID c0734a8c282c395018afc9aa05c47ed2d4a16c15
# Parent  751ed145bdae5d27edc576360245028ff96b6c79
Fix InEdgeIt and OutEdgeIt in the symmetric graphs.

diff -r 751ed145bdae -r c0734a8c282c src/hugo/list_graph.h
--- a/src/hugo/list_graph.h	Tue Sep 28 13:45:39 2004 +0000
+++ b/src/hugo/list_graph.h	Tue Sep 28 16:40:55 2004 +0000
@@ -102,6 +102,7 @@
 	first_free_node(_g.first_free_node), edges(_g.edges),
 	first_free_edge(_g.first_free_edge) {}
     
+    /// \bug In the vector can be hole if a node is erased from the graph.
     ///Number of nodes.
     int nodeNum() const { return nodes.size(); }
     ///Number of edges.
@@ -579,7 +580,7 @@
     public: 
       OutEdgeIt() {}
       OutEdgeIt(const SymListGraph& g, Edge e) { 
-	if (e.id & 1 == 0) {	
+	if ((e.id & 1) == 0) {	
 	  out = Parent::OutEdgeIt(g, SymEdge(e));
 	  in = Parent::InEdgeIt(g, g.tail(e));
 	} else {
@@ -616,7 +617,7 @@
     public: 
       InEdgeIt() {}
       InEdgeIt(const SymListGraph& g, Edge e) { 
-	if (e.id & 1 == 0) {	
+	if ((e.id & 1) == 0) {	
 	  out = Parent::OutEdgeIt(g, SymEdge(e));
 	  in = Parent::InEdgeIt(g, g.tail(e));
 	} else {
@@ -732,12 +733,12 @@
 
 
     Node tail(Edge e) const { 
-      return e.id & 1 == 0 ? 
+      return (e.id & 1) == 0 ? 
 	Parent::tail(SymEdge(e)) : Parent::head(SymEdge(e)); 
     }
 
     Node head(Edge e) const { 
-      return e.id & 1 == 0 ? 
+      return (e.id & 1) == 0 ? 
 	Parent::head(SymEdge(e)) : Parent::tail(SymEdge(e)); 
     }
 
@@ -822,14 +823,14 @@
       return INVALID;
     }
 
-    /// Finds an symmetric edge between two nodes.
+//     /// Finds an symmetric edge between two nodes.
 
-    /// Finds an symmetric edge from node \c u to node \c v.
-    ///
-    /// If \c prev is \ref INVALID (this is the default value), then
-    /// It finds the first edge from \c u to \c v. Otherwise it looks for
-    /// the next edge from \c u to \c v after \c prev.
-    /// \return The found edge or INVALID if there is no such an edge.
+//     /// Finds an symmetric edge from node \c u to node \c v.
+//     ///
+//     /// If \c prev is \ref INVALID (this is the default value), then
+//     /// It finds the first edge from \c u to \c v. Otherwise it looks for
+//     /// the next edge from \c u to \c v after \c prev.
+//     /// \return The found edge or INVALID if there is no such an edge.
 
 //     SymEdge findEdge(Node u, Node v, SymEdge prev = INVALID) 
 //     {     
@@ -873,7 +874,7 @@
     }
 
     static Edge backward(SymEdge e) {
-      return Edge((id(e) << 1) & 1);
+      return Edge((id(e) << 1) | 1);
     }
 
   };
diff -r 751ed145bdae -r c0734a8c282c src/hugo/smart_graph.h
--- a/src/hugo/smart_graph.h	Tue Sep 28 13:45:39 2004 +0000
+++ b/src/hugo/smart_graph.h	Tue Sep 28 16:40:55 2004 +0000
@@ -394,7 +394,7 @@
     public: 
       OutEdgeIt() {}
       OutEdgeIt(const SymSmartGraph& g, Edge e) { 
-	if (e.id & 1 == 0) {	
+	if ((e.id & 1) == 0) {	
 	  out = Parent::OutEdgeIt(g, SymEdge(e));
 	  in = Parent::InEdgeIt(g, g.tail(e));
 	} else {
@@ -431,7 +431,7 @@
     public: 
       InEdgeIt() {}
       InEdgeIt(const SymSmartGraph& g, Edge e) { 
-	if (e.id & 1 == 0) {	
+	if ((e.id & 1) == 0) {	
 	  out = Parent::OutEdgeIt(g, SymEdge(e));
 	  in = Parent::InEdgeIt(g, g.tail(e));
 	} else {
@@ -540,12 +540,12 @@
 
 
     Node tail(Edge e) const { 
-      return e.id & 1 == 0 ? 
+      return (e.id & 1) == 0 ? 
 	Parent::tail(SymEdge(e)) : Parent::head(SymEdge(e)); 
     }
 
     Node head(Edge e) const { 
-      return e.id & 1 == 0 ? 
+      return (e.id & 1) == 0 ? 
 	Parent::head(SymEdge(e)) : Parent::tail(SymEdge(e)); 
     }
 
@@ -630,14 +630,14 @@
       return INVALID;
     }
 
-    /// Finds an symmetric edge between two nodes.
+//     /// Finds an symmetric edge between two nodes.
 
-    /// Finds an symmetric edge from node \c u to node \c v.
-    ///
-    /// If \c prev is \ref INVALID (this is the default value), then
-    /// It finds the first edge from \c u to \c v. Otherwise it looks for
-    /// the next edge from \c u to \c v after \c prev.
-    /// \return The found edge or INVALID if there is no such an edge.
+//     /// Finds an symmetric edge from node \c u to node \c v.
+//     ///
+//     /// If \c prev is \ref INVALID (this is the default value), then
+//     /// It finds the first edge from \c u to \c v. Otherwise it looks for
+//     /// the next edge from \c u to \c v after \c prev.
+//     /// \return The found edge or INVALID if there is no such an edge.
 
 //     SymEdge findEdge(Node u, Node v, SymEdge prev = INVALID) 
 //     {     
@@ -667,7 +667,7 @@
     }
 
     static Edge backward(SymEdge e) {
-      return Edge((id(e) << 1) & 1);
+      return Edge((id(e) << 1) | 1);
     }
 
   };
diff -r 751ed145bdae -r c0734a8c282c src/test/graph_test.h
--- a/src/test/graph_test.h	Tue Sep 28 13:45:39 2004 +0000
+++ b/src/test/graph_test.h	Tue Sep 28 16:40:55 2004 +0000
@@ -298,6 +298,7 @@
       typename Graph::OutEdgeIt e(G,n);
       for(int i=0;i<nn;i++) {
 	check(e!=INVALID,"Wrong OutEdge list linking.");
+	check(n==G.tail(e), "Wrong OutEdge list linking.");
 	++e;
       }
       check(e==INVALID,"Wrong OutEdge list linking.");
@@ -310,6 +311,7 @@
       typename Graph::InEdgeIt e(G,n);
       for(int i=0;i<nn;i++) {
 	check(e!=INVALID,"Wrong InEdge list linking.");
+	check(n==G.head(e), "Wrong InEdge list linking.");
 	++e;
       }
       check(e==INVALID,"Wrong InEdge list linking.");