Li Ning wrote:

typedef adjacency_list graph_t;

typedef graph_traits::vertex_descriptor vertex_t; typedef graph_traits::edge_descriptor edge_t;

struct edge_ex { //int index; bw_t az_capacity; bw_t za_capacity; int cost; vertex_t fake_source; }; // init a graph g and assign edge_ex values, and get a std::pair r when add_edge(5,6,g); graph_t g2 = g; std::pair rr = edge(5,6,g2); g2[rr.first].cost = 1000;

std::cout<

//output is: old_value old_value 1000

WHY?? It seems a bug, g2[r.first] should be 1000 rather than the value assign to g even r.first is a descriptor that belongs to g OK, this is problematic usage, but... g2[r.first] works, it doesn't make sense.

Sorry, should be std::cout<http://www.nabble.com/-BGL--problem-about-copy-graph-tp23921384p23921431.htm... Sent from the Boost - Users mailing list archive at Nabble.com.