# HG changeset patch
# User Balazs Dezso <deba@inf.elte.hu>
# Date 2008-07-29 13:58:03
# Node ID 79643f6e8c520e9c963c84f39eb091a460daa4fe
# Parent  9c8efad5f587ab80bc4dc76918e4fdbc2adfc905

Converting INVALID arc to INVALID edge

diff --git a/lemon/list_graph.h b/lemon/list_graph.h
--- a/lemon/list_graph.h
+++ b/lemon/list_graph.h
@@ -842,7 +842,9 @@
       explicit Arc(int pid) { id = pid;}
 
     public:
-      operator Edge() const { return edgeFromId(id / 2); }
+      operator Edge() const { 
+        return id != -1 ? edgeFromId(id / 2) : INVALID; 
+      }
 
       Arc() {}
       Arc (Invalid) { id = -1; }
diff --git a/lemon/smart_graph.h b/lemon/smart_graph.h
--- a/lemon/smart_graph.h
+++ b/lemon/smart_graph.h
@@ -465,7 +465,9 @@
       explicit Arc(int id) { _id = id;}
 
     public:
-      operator Edge() const { return edgeFromId(_id / 2); }
+      operator Edge() const { 
+        return _id != -1 ? edgeFromId(_id / 2) : INVALID; 
+      }
 
       Arc() {}
       Arc (Invalid) { _id = -1; }