1.1 --- a/lemon/dfs.h	Tue Dec 02 15:33:22 2008 +0000
     1.2 +++ b/lemon/dfs.h	Fri Dec 05 00:22:47 2008 +0100
     1.3 @@ -1625,7 +1625,7 @@
     1.4      ///
     1.5      /// \pre Either \ref run(Node) "run()" or \ref init()
     1.6      /// must be called before using this function.
     1.7 -    bool reached(Node v) { return (*_reached)[v]; }
     1.8 +    bool reached(Node v) const { return (*_reached)[v]; }
     1.9  
    1.10      ///@}
    1.11