Re: [boost] copying multigraphs

From: Mohamed Anouar Rachdi (marachdi_at_[hidden])
Date: 2006-10-05 15:58:47

Alex Breuer wrote:

>On Oct 5, 2006, at 2:33 PM, Mohamed Anouar Rachdi wrote:
>
>  
>
>>###################################################################### 
>>###
>>  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.
>
>  
>
>>      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!!!

>>###################################################################### 
>>########
>>
>>
>>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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