Vladimir Prus — Fri, 30 Apr 2004 06:13:39 GMT

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I think it's a bug indeed. I've fixed it locally, but before comitting I'd like
to add a test. Could you provide a minimal example which fails/crashes
unless this is fixed?

parakhin — Sat, 01 May 2004 21:13:59 GMT

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Well, actually you can only make it crash consistently building
with STLPort with _STLP_DEBUG macro defined - only then
dereferencing invalid iterator is checked. In all other cases it
may crush - or it may not (coz dereferencing an invalid
iterator causes an undefined behavior)
#define _STLP_DEBUG
#include <boost/config.hpp>
#include <iostream>
#include <boost/graph/subgraph.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graph_utility.hpp>
int main(int,char*[])
{
  using namespace boost;
  typedef adjacency_list_traits<vecS, vecS, directedS> Traits;
  typedef subgraph< adjacency_list<vecS, vecS, directedS,
    property<vertex_color_t, int>, property<edge_index_t,
int> > > Graph;
  const int N = 6;
  Graph G0(N);
  enum { A, B, C, D, E, F};
  Graph& G1 = G0.create_subgraph();
  add_vertex(C, G1);
  G1.find_vertex(78);
  return 0;
}

status changed

Douglas Gregor — Sun, 31 Oct 2004 18:48:35 GMT

status assigned → closed

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This bug has been fixed in 1.32.0: confirmed with libstdc++ debug mode.

Boost C++ Libraries: Ticket #261: Dereferencing invalid iterator

status changed