Index: boost/graph/two_bit_color_map.hpp
===================================================================
--- boost/graph/two_bit_color_map.hpp	(revision 60155)
+++ boost/graph/two_bit_color_map.hpp	(working copy)
@@ -39,7 +39,7 @@
 };
 
 
-template<typename IndexMap = identity_property_map>
+template<typename IndexMap = identity_property_map, typename T=void>
 struct two_bit_color_map 
 {
   std::size_t n;
@@ -61,10 +61,10 @@
   }
 };
 
-template<typename IndexMap>
+template<typename IndexMap, typename T>
 inline two_bit_color_type
-get(const two_bit_color_map<IndexMap>& pm, 
-    typename two_bit_color_map<IndexMap>::key_type key) 
+get(const two_bit_color_map<IndexMap, T>& pm, 
+    typename two_bit_color_map<IndexMap, T>::key_type key) 
 {
   BOOST_STATIC_CONSTANT(int, elements_per_char = two_bit_color_map<IndexMap>::elements_per_char);
   typename property_traits<IndexMap>::value_type i = get(pm.index, key);