xml_object_range now supports Boost.ForEach

git-svn-id: http://pugixml.googlecode.com/svn/trunk@890 99668b35-9821-0410-8761-19e4c4f06640

src/pugixml.hpp

@@ -216,6 +216,8 @@ namespace pugi
     template <typename It> class xml_object_range
     {
     public:
+        typedef It const_iterator;
+
         xml_object_range(It b, It e): _begin(b), _end(e)
         {
         }