It would be useful to know exactly where in copy_graph things are segfaulting. It is not unlikely that memory management problems upstream of your call to copy_graph are causing things to go bad later. Try using valgrind. On Oct 5, 2006, at 3:58 PM, Mohamed Anouar Rachdi wrote:

Alex Breuer wrote:

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On Oct 5, 2006, at 2:33 PM, Mohamed Anouar Rachdi wrote:

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#################################################################### ## ### typename graph_traits<Graph>::edge_descriptor ed; bool exist;

typename graph_traits<Graph>::edge_iterator ei, ei_end;

Graph copyGraph;

typename boost::property_map<Graph, edge_weight_t>::type weight = get(edge_weight, graph); typename boost::property_map<Graph, edge_index_t>::type edge_id = get(edge_index, graph);

typename boost::property_map<Graph, edge_weight_t>::type weightc = get(edge_weight, copyGraph); typename boost::property_map<Graph, edge_index_t>::type edge_idc = get(edge_index, copyGraph);

for ( tie(ei, ei_end)=edges(graph); ei != ei_end; ei++ ) { tie(ed, exist)= add_edge( source(*ei,graph), target(*ei,graph), copyGraph);

At this point, you've got a new edge, ed, in your copyGraph, but you're trying to use the edge descriptor from your old graph, ei, to access copyGraph's property maps, which may cause bad things to happen.

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put(edge_idc, ed, edge_id[*ei]); put(weightc, ed, weight[*ei]); }

here i'm just trying to copy the property map from graph to copyGraph i think it's the same than doing edge_idc[*ed] = edge_id[*ei];

I'm i wrong??

it' doesn't tell me why when i used copy_graph wich is a boost function it also behave the same way since i got a segfault at the second call!!!

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#################################################################### ## ########

hello everyone,

i have a problem with this code that is used inside a fonction wich a call in a loop

after 2 or 3 calls i have a segfault at the line with add_edge

i'm using multigraphs

Ps : i got the same probleme whiel using copy_graph (graph,copyGraph)

is there any suggestions.....

thanx

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