diff -r ea1fa1bc3f6d -r f27dfd29c5c0 lemon/iterable_maps.h
--- a/lemon/iterable_maps.h	Wed Jun 28 15:06:24 2006 +0000
+++ b/lemon/iterable_maps.h	Wed Jun 28 15:28:38 2006 +0000
@@ -126,7 +126,7 @@
     /// \brief Constructor of the Map with a default value.
     ///
     /// Constructor of the Map with a default value.
-    IterableBoolMap(const Graph& _graph, bool def = false) 
+    explicit IterableBoolMap(const Graph& _graph, bool def = false) 
       : Parent(_graph), graph(_graph) {
       for (KeyIt it(graph); it != INVALID; ++it) {
         Parent::set(it, array.size());
@@ -203,7 +203,7 @@
       /// Creates an iterator. It iterates on the 
       /// keys which mapped to true.
       /// \param _map The IterableIntMap
-      TrueIt(const IterableBoolMap& _map) 
+      explicit TrueIt(const IterableBoolMap& _map) 
         : Parent(_map.sep > 0 ? _map.array[_map.sep - 1] : INVALID), 
           map(&_map) {}
 
@@ -243,7 +243,7 @@
       /// Creates an iterator. It iterates on the 
       /// keys which mapped to false.
       /// \param _map The IterableIntMap
-      FalseIt(const IterableBoolMap& _map) 
+      explicit FalseIt(const IterableBoolMap& _map) 
         : Parent(_map.sep < (int)_map.array.size() ? 
                  _map.array.back() : INVALID), map(&_map) {}