RhodeCode

  struct ArcNumTagIndicator {

    static const bool value = false;

  };

  template <typename Graph>

  struct ArcNumTagIndicator<

    Graph,

    typename enable_if<typename Graph::ArcNumTag, void>::type

  > {

    static const bool value = true;

  };

  template <typename Graph, typename Enable = void>

  struct FindArcTagIndicator {

    static const bool value = false;

  };

  template <typename Graph>

  struct FindArcTagIndicator<

    Graph,

    typename enable_if<typename Graph::FindArcTag, void>::type

  > {

    static const bool value = true;

  };

  template <typename Graph, typename Enable = void>

    typedef True ArcNumTag;

    typedef True FindArcTag;

    typedef True EdgeNumTag;

    typedef True FindArcTag;

    typedef True ArcNumTag;