[Click] dynamic_cast ?

[Harald Schiöberg]

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Eddie Kohler wrote:
> Hi Harald,
> 
> Click elements don't know what element(s) are connected to a push input
> port, or a pull output port.  This is because it is valid for one or
> more elements to connect there.
> 
> So if e->input_is_push(i), then e->input(i).element() == 0.
> 
> To find the element or elements connected to a push input port, use
> Router functions to traverse the element graph.  I've just checked in a
> rework of this functionality that should help you.  On current mainline,
> you could say:
> 
> #include <click/routervisitor.hh>
> ...
> ElementNeighborTracker tracker(router());
> router()->visit_upstream(this, 0, &tracker);
> tracker.elements() // is a vector containing exactly those elements
>                    // that are connected to [0]this
> 
> Does this make sense?

Thanks a lot, works and makes perfect sense.

attached a small patch that I found very useful when using that stuff...

Harald


- --
Harald Schiöberg
Technische Universität Berlin | T-Laboratories | FG INET
www: http://www.net.t-labs.tu-berlin.de
Phone: +49-(0)30-8353-58476 | Fax: +49-(0)391 534 783 47
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