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Connecting classes

Hi,

I am trying to the queue class such that it will query or set the link
speed
on the link class on the event basis. I did the following changes but
I get segmentation fault:

In object.h 
 class NsObject : public TclObject, public Handler {
I define a new virtual function:
virtual double bandwidth() = 0;
 

bandwidth is the function defined in delay.cc in class LinkDelay :
public Connector {

        double bandwidth() const { return bandwidth_; }

Now in the queue.cc in void Queue::recv(Packet* p, Handler*)

I call the statement temp = target_->bandwidth();


I am getting segmentation fault on running any tcl script. Please help.
Your help is very much appreciated.

-Sanjay
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