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Opened 10 years ago

Closed 9 years ago

#1622 closed Bugs (fixed)

Adjacency list needs to handle self-edges correctly

Reported by: Aaron Windsor Owned by: Andrew Sutton
Milestone: Boost 1.36.0 Component: graph
Version: Boost 1.34.1 Severity: Problem
Keywords: Cc:

Description

The following short program crashes as of boost 1.35:

#include <boost/graph/adjacency_list.hpp>

int main() {

using namespace boost; typedef adjacency_list<vecS, vecS, undirectedS > graph_t; graph_t g(5); add_edge(2, 2, g); remove_edge(2, 2, g);

}

The problem is that (2,2) is stored once in the list of edges in the graph and twice in the list of adjacent edges to the vertex 2. When remove_edge is called, the global graph edge (2,2) is deleted twice, causing a segfault. This problem is discussed in the following thread: http://lists.boost.org/Archives/boost/2007/02/116547.php.

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Change History (3)

comment:1 Changed 10 years ago by Aaron Windsor

Status: newassigned

comment:2 Changed 9 years ago by Andrew Sutton

Owner: changed from Aaron Windsor to Andrew Sutton
Status: assignednew

Removing the loop using remove_edge(e, g) does not seem to trigger the same segfault.

comment:3 Changed 9 years ago by Andrew Sutton

Resolution: fixed
Status: newclosed

(In [50206]) Fixed #1622. A viable solution relies on the fact that incident edges in a loop are stored adjacently in the out edge list of the vertex. A simple modification of the global edge erasing loop for undirected graphs will skip the next iterator if both the current and next contain the same iterator.

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