id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
7507,BGL subgraph copy constructor buggy,Amyn Bennamane <amynbe@…>,Jeremiah Willcock,"Hello,

I store subgraph objects in a std::list.

After this, most of the data contained in subgraphs are lost.

Attached is a minimalist code that creates a root graph and two childen, and then displays them directly, then insert them into a (copy-on-write) list, then displays them again.

The root redisplays too much, and children lose data.

I am on MacOSX with gcc 6; maybe on other platforms the copy would not happen, since I don't modify the graphs between insertion and display.

Here is my output: 

{{{

From the stack: 
(root) graph: 6(0,2) 4(1,2) 
num_edges= 2
subgraph: 0(0,1) 
num_edges= 1
subgraph: 0(0,1) 
num_edges= 1

From list: 
graph: 0(0,1) 1(1,2) 2(1,3) 6(2,5) 3(4,1) 4(4,5) 5(5,3) 
num_edges= 7
graph: 
num_edges= 0
graph: 
num_edges= 0
}}}

",Bugs,new,To Be Determined,graph,Boost 1.51.0,Problem,,"copy-on-write, subgraph copy constructor",