Re: [Boost-users] Getting vertices names.

From: Maxx Sloyko (maxxua_at_[hidden])
Date: 2004-02-24 11:40:45

Hi there! Here is my piece of code, where the error raises:

void MyGraph::Load( string filename )
{
        using namespace boost;
        graph_traits<GraphvizDigraph>::vertex_iterator i;
        GraphvizDigraph g;
        read_graphviz(filename, g);

        graph_property<GraphvizDigraph, graph_name_t>::type&
                name = get_property( g, graph_name );
        Name( name );

        boost::property_map<boost::GraphvizDigraph, 
boost::vertex_attribute_t>::type&
                va = boost::get(boost::vertex_attribute, g);
        boost::property_map< GraphvizDigraph,
                vertex_name_t>::type&
                vn = get(vertex_name, g);

        /* First, lets load all needed properties for vertices */
        for(i = vertices(g).first; i != vertices(g).second; ++i )
        {
                map<string, string>& m = va[(*i)];
                for(
                                std::map<string, string>::const_iterator 
p_key = m.begin();
                                p_key != m.end();
                                ++p_key
                        )
                        {
                                std::cout<<vn[(*i)]<<endl;
/* ^^^^ this is the line where the problem arises. he thing is to make 
the following line work (first argument is std::string ), but there was 
an error here and i decided to test like this. */
                                SetObjAttribute( vn[(*i)], 
const_cast<std::string&>(p_key->first), const_cast<std::string&>(p_key-
>second) );
                        }
        }
} 

Jeremy Siek <jsiek_at_[hidden]>:

> Hi Maxx,
> 
>  From what you've posted, I can't tell what the problem is.
> If you post a short but complete program exhibiting the problem
> I'll take a look.
> 
> Cheers,
> Jeremy
> 
> On Feb 24, 2004, at 8:42 AM, Maxx Sloyko wrote:
> 
> >     Hi there!
> >
> > May be I'm asking something unbeleivably stupid, but anyway here is 
my
> > problem.
> > I need to get the names of all vertices in the graph (It is
> > GraphvizDigraph), so
> > ----------------------------------------------------
> > using namespace boost;
> > property_map< GraphvizDigraph,
> > 		vertex_name_t>::type&
> > 		vn = get(vertex_name, g);
> > graph_traits<GraphvizDigraph>::vertex_iterator i;
> >
> > for(i = vertices(g).first; i != vertices(g).second; ++i )
> > {
> >         std::cout<< vn[*i]<<endl;
> > }
> > ----------------------------------------------------
> >
> > And here is the error I got:
> > ----------------------------------------------------
> > c:\Documents and Settings\MAKC\My Documents\Visual Studio
> > Projects\Graph\MyGraph.cpp(61) : error C2679: binary '<<' : no 
operator
> > found which takes a right-hand operand of
> > type  
> > 'boost::vec_adj_list_any_vertex_pa::bind_<Tag,Graph,Property>::value
> > _type' (or there is no acceptable conversion)
> >         with
> >         [
> >             Tag=boost::vertex_name_t,
> > Graph=boost::detail::subgraph_any_pmap::bind_<boost:: 
> > vertex_name_t,boost:
> > :GraphvizDigraph,boost::detail::vertex_property_map<boost:: 
> > GraphvizDigrap
> > h,boost::vertex_name_t>::Property>::Graph,
> >
> > Property=boost::detail::vertex_property_map<boost::detail:: 
> > subgraph_any_p
> > 
map::bind_<boost::vertex_name_t,boost::GraphvizDigraph,boost::detail:: 
> > ver
> > tex_property_map<boost::GraphvizDigraph,boost::vertex_name_t>:: 
> > Property>:
> > :Graph,boost::vertex_name_t>::Property
> >         ]
> > -----------------------------------------------------
> >
> >
> > Since this code is almost "CopyPasted" from the library example,
> > my beleif is that it should work. At what point I have to change my
> > worldview? :)
> >
> > Thanks in advance.
> >
> >
> > -------------------------------------
> > |your sincerely, Maxx,              |
> > |          mailto:maxxua_at_[hidden]  |
> > -------------------------------------
> > _______________________________________________
> > Boost-users mailing list
> > Boost-users_at_[hidden]
> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
> >
> _______________________________________________
> Jeremy Siek <jsiek_at_[hidden]>
> http://www.osl.iu.edu/~jsiek
> Ph.D. Student, Indiana University Bloomington
> C++ Booster (http://www.boost.org)
> Office phone: [phone]
> _______________________________________________
> 
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
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> 

-------------------------------------
|your sincerely, Maxx,              |
|          mailto:maxxua_at_[hidden]  |
-------------------------------------