[Networkit] Weird bug: forEdgesOf iterates wrong edged
Lukas Barth
lists at tinloaf.de
Mon Dec 1 12:03:44 CET 2014
Hi everyone,
I'm currently trying to use NetworKit for a university project, and I'm
experiencing a strange bug I cannot explain. This is my (abbreviated) code:
=========
... walkToTransit(node prevNode, node curNode) const {
if (this->G.degree(curNode) > 2) {
return {curNode, 0};
}
std::cout << "Walking on " << curNode << "\n";
std::cout << "degree: " << this->G.degree(curNode) << "\n";
Transit next;
int nextDist = std::numeric_limits<int>::max();
G.forEdgesOf(curNode, [&](node cur, node v, double weight) {
std::cout << "Next node: " << v << " from " << cur << "\n";
if (v != prevNode) {
assert(nextDist == std::numeric_limits<int>::max());
next = this->walkToTransit(curNode, v);
nextDist = (int)weight;
}
});
[...]
=========
Now, that gives me this output:
=========
[...]
Walking on 93573
degree: 2
Next node: 119538 from 93573
Next node: 46333 from 93573
Next node: 105480 from 46333
Next node: 14505 from 105480
hl: src/HubLabeling.h:129:
HubLabeling<HubLabels>::walkToTransit(NetworKit::node, NetworKit::node)
const [with HubLabels = DynamicHubLabels; Transit = transit_st;
NetworKit::node = long unsigned int]::__lambda6: Assertion `nextDist ==
std::numeric_limits<int>::max()' failed.
=========
How can that be? I'm iterating the edges of node #93573 (curNode), so in
the handle, "cur" should always be 93573. Yet, after the first two edges
(which are all the edges that node should have, see the degree), I keep
getting edges of adjacent vertices...?
I checked: Using forNeighborsOf() gives me the same results.
Did anyone ever see something like this? Any ideas where this comes from?
Kind regards,
Lukas Barth
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