1.1 --- a/lemon/bits/iterable_graph_extender.h	Tue Jun 07 16:11:23 2005 +0000
     1.2 +++ b/lemon/bits/iterable_graph_extender.h	Tue Jun 07 16:12:14 2005 +0000
     1.3 @@ -3,6 +3,7 @@
     1.4  #define LEMON_ITERABLE_GRAPH_EXTENDER_H
     1.5  
     1.6  #include <lemon/invalid.h>
     1.7 +#include <lemon/utility.h>
     1.8  
     1.9  namespace lemon {
    1.10    
    1.11 @@ -10,6 +11,13 @@
    1.12    class IterableGraphExtender : public _Base {
    1.13    public:
    1.14  
    1.15 +    /// Indicates that the graph is undirected.
    1.16 +
    1.17 +    ///\todo Better name?
    1.18 +    ///
    1.19 +    ///\bug Should it be here?
    1.20 +    typedef False UndirTag;
    1.21 +
    1.22      typedef _Base Parent;
    1.23      typedef IterableGraphExtender<_Base> Graph;
    1.24  
    1.25 @@ -170,6 +178,15 @@
    1.26    class IterableUndirGraphExtender : public IterableGraphExtender<_Base> {
    1.27    public:
    1.28  
    1.29 +    /// Indicates that the graph is undirected.
    1.30 +
    1.31 +    ///\todo Better name?
    1.32 +    ///
    1.33 +    ///\bug Should it be here?
    1.34 +    ///\bug Should be tested in the concept checker whether it is defined
    1.35 +    ///correctly.
    1.36 +    typedef True UndirTag;
    1.37 +
    1.38      typedef IterableGraphExtender<_Base> Parent;
    1.39      typedef IterableUndirGraphExtender<_Base> Graph;
    1.40      typedef typename Parent::Node Node;