diff -r d769d2eb4d50 -r 080d51024ac5 lemon/list_graph.h
--- a/lemon/list_graph.h	Mon Apr 03 09:24:38 2006 +0000
+++ b/lemon/list_graph.h	Mon Apr 03 09:45:23 2006 +0000
@@ -66,7 +66,7 @@
     protected:
 
       int id;
-      Node(int pid) { id = pid;}
+      explicit Node(int pid) { id = pid;}
 
     public:
       Node() {}
@@ -81,7 +81,7 @@
     protected:
 
       int id;
-      Edge(int pid) { id = pid;}
+      explicit Edge(int pid) { id = pid;}
 
     public:
       Edge() {}
@@ -110,8 +110,8 @@
     ///\sa id(Edge)
     int maxEdgeId() const { return edges.size()-1; }
 
-    Node source(Edge e) const { return edges[e.id].source; }
-    Node target(Edge e) const { return edges[e.id].target; }
+    Node source(Edge e) const { return Node(edges[e.id].source); }
+    Node target(Edge e) const { return Node(edges[e.id].target); }
 
 
     void first(Node& node) const { 
@@ -676,7 +676,7 @@
     protected:
       int id;
 
-      Node(int _id) : id(_id) {}
+      explicit Node(int _id) : id(_id) {}
     public:
       Node() {}
       Node(Invalid) { id = -1; }
@@ -690,7 +690,7 @@
     protected:
       int id;
 
-      Edge(int _id) { id = _id;}
+      explicit Edge(int _id) { id = _id;}
     public:
       Edge() {}
       Edge (Invalid) { id = -1; }