Re: [Boost-users] [Graph] edge() not working

From: Line B. Reinhardt (lbr_at_[hidden])
Date: 2007-08-31 08:14:33

Hi 
I am not sure I understand your program. 

But I know I do the same thing to check for existence of edges however I
use edge_descriptor (and I work on a directed graph) instead
edge_descriptor_type:

 typedef typename
boost::graph_traits<my_graph_type>::edge_descriptor_type edge;

I did not know that there was anything called an edge_descriptor_type ??

Does this help??

g++ often give strange error messages.

Best regards 
    Line R.

-----Original Message-----
From: boost-users-bounces_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] On Behalf Of David A.
Greene
Sent: 31. august 2007 02:48
To: boost-users_at_[hidden]
Subject: [Boost-users] [Graph] edge() not working

[Apologies if this has been asked before.  Gmane is down and Google
didn't 
 return anything interesting.]

I have a Boost (1.34.1) Graph declared like this:

      typedef boost::adjacency_list<boost::setS,    // Out edge list
type
                                    boost::listS,    // Vertex list type

                                    boost::undirectedS,
                                    vertex_property_bundle // Vertex
properties
                                    // Edge properties
				    > my_graph_type;

I want to find out if an edge is in the graph:

      typedef typename boost::graph_traits<my_graph_type>::
      edge_descriptor_type edge;

      edge e;
      bool present;
      boost::tie(e, present) = edge(v1, v2, my_graph);

Unfortunately, g++ 4.1.2 doesn't like it:

error: no matching function for call to
boost::detail::edge_desc_impl<boost::undirected_tag, 
void*>::edge_desc_impl(void* const&, void* const&, 
boost::adjacency_list<boost::setS, 
boost::listS, boost::undirectedS, vertex_property_bundle,
boost::no_property, 
boost::no_property, boost::listS>&)

boost-1_34_1/boost/graph/detail/edge.hpp:43: note: candidates are: 
boost::detail::edge_desc_impl<Directed, Vertex>::edge_desc_impl(Vertex, 
Vertex, const void*) [with Directed = boost::undirected_tag, Vertex =
void*]

boost-1_34_1/boost/graph/detail/edge.hpp:41: 
note:                 boost::detail::edge_desc_impl<Directed, 
Vertex>::edge_desc_impl() [with Directed = boost::undirected_tag, Vertex
= 
void*]

boost/graph/detail/edge.hpp:35: 
note:
boost::detail::edge_desc_impl<boost::undirected_tag, 
void*>::edge_desc_impl(const 
boost::detail::edge_desc_impl<boost::undirected_tag, void*>&)

Has anyone else run into this problem before?  How does a reference to
the
graph get passed to edge_desc_impl's constructor?

Thanks.

                                                     -Dave
_______________________________________________
Boost-users mailing list
Boost-users_at_[hidden]
http://lists.boost.org/mailman/listinfo.cgi/boost-users