Hi Hugues, The bug is in your program, not in the BGL. The first invocation of remove_vertex invalidates all of the vertex descriptors in the array. Thus the following calls to remove_vertex are being passed invalid vertex descriptors, which does not have defined behaviour. If you want vertex descriptor stability, use listS for the VertexList parameter of adjacency_list. -Jeremy On Apr 30, 2004, at 7:28 AM, Hugues Joly wrote:
Hi, I have found a bug with the adjacency_list. It seems that there's a bug with the deletion of a vertex.
See the attachment for a small program that triggers the problem.
Thanks in advance.
__________________________________________________________ Lèche-vitrine ou lèche-écran ? magasinage.yahoo.ca// test.cpp : Defines the entry point for the console application. //
#include "stdafx.h" #include <boost/config.hpp> #include <iostream> #include <boost/graph/subgraph.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/graph_utility.hpp>
int _tmain(int argc, _TCHAR* argv[]) { using namespace boost; //typedef adjacency_list_traits<vecS, vecS, directedS> Traits;// Does nothing? typedef boost::property<boost::vertex_color_t, int, boost::property< boost::vertex_name_t, std::string > > VertexProperty;
typedef adjacency_list<vecS, vecS, directedS, VertexProperty, property<edge_index_t, int> > Graph;
Graph G0; Graph::vertex_descriptor v_descr[4]; Graph::edge_descriptor e_descr[4];
for (int i = 0; i < 4; i++) { v_descr[i] = boost::add_vertex(G0); }
for (int i = 0; i < 4; i++) { boost::remove_vertex(v_descr[i], G0); }
return 0; }
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Jeremy Siek <jsiek@osl.iu.edu> http://www.osl.iu.edu/~jsiek Ph.D. Student, Indiana University Bloomington Graduating in August 2004 and looking for work C++ Booster (http://www.boost.org) _______________________________________________