1.1 --- a/lemon/bits/traits.h	Tue Jul 15 18:43:41 2008 +0100
     1.2 +++ b/lemon/bits/traits.h	Tue Jul 15 18:49:30 2008 +0100
     1.3 @@ -19,13 +19,16 @@
     1.4  #ifndef LEMON_BITS_TRAITS_H
     1.5  #define LEMON_BITS_TRAITS_H
     1.6  
     1.7 -#include <lemon/bits/utility.h>
     1.8 -
     1.9  ///\file
    1.10  ///\brief Traits for graphs and maps
    1.11  ///
    1.12  
    1.13 +#include <lemon/bits/enable_if.h>
    1.14 +
    1.15  namespace lemon {
    1.16 +
    1.17 +  struct InvalidType {};
    1.18 +
    1.19    template <typename _Graph, typename _Item>
    1.20    class ItemSetTraits {};
    1.21