1.1 --- a/lemon/circulation.h	Wed Nov 28 17:51:02 2007 +0000
     1.2 +++ b/lemon/circulation.h	Wed Nov 28 18:01:38 2007 +0000
     1.3 @@ -231,6 +231,12 @@
     1.4  
     1.5      /// @}
     1.6  
     1.7 +  protected:
     1.8 +
     1.9 +    Circulation() {}
    1.10 +  
    1.11 +  public:
    1.12 +
    1.13      /// The constructor of the class.
    1.14  
    1.15      /// The constructor of the class.