Re: [Boost-users] BGL: Copying graphs and edge_descriptors confusion

Subject: Re: [Boost-users] BGL: Copying graphs and edge_descriptors confusion
From: Jeremiah Willcock (jewillco_at_[hidden])
Date: 2011-06-27 13:49:33

On Mon, 27 Jun 2011, David Doria wrote:

>> I can't explain to you why you observe this unexpected behavior, but there is
>> also the copy_graph() function in the BGL which might perhaps suit your needs?
>
> Good to know, but that didn't change anything. I changed
>
>  Graph g = inputGraph;
>
> to
>
>  Graph g;
>  boost::copy_graph(inputGraph, g);
>
> and the output was identical.
>
> Any other thoughts?

Iterators are not preserved among copies of an object; they aren't in STL 
either.  You need to use iterators from the same graph that you are trying 
to access with them.  Note that this is also true for vertex and edge 
descriptors for some graph types (listS is the most common).

-- Jeremiah Willcock