edge vector corruption

[Nathan Sidwell]

Jan Hubicka wrote:

>>If edge vectors can be reallocated in such loops, then the iterators need
>>redesigning.
> 
> It always has been possible to do so easilly, so I would guess we do it
> from time to time.
Though not an edge expert, I am inclined to agree.  This case was buried
several levels in.

> In edge forwarding it is quite important for time complexity (ie we need
> to walk all edges together with possibly elliminating them in linear
> time).  This is why it used
>   for (e = b->succ; e; e = next)
> ...
>         next = e->succ_next;
> other places that are mine will use same paradigm, so it is easy to grep
> for "next = e".

or a
	for (ix = 0; EDGE_ITERATE (b->succ, ix, e); ix++)
	{...}
I proposed -- but y'all are fed up with me going on about that :)

nathan

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