[Click] dynamic_cast ?

[Eddie Kohler]

Harald, thanks -- I'll check a variant of this in!  But clear() functions 
generally return void, and so will this one.

Eddie


Harald Schiöberg wrote:
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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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