Re: [Boost-users] Getting vertices names.

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::type& name = get_property( g, graph_name ); Name( name ); boost::property_map::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& m = va[(*i)]; for( std::map::const_iterator p_key = m.begin(); p_key != m.end(); ++p_key ) { std::cout<std::string&(p_key->first), const_caststd::string&(p_key-

second) ); } } }

Jeremy Siek :

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]<

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_::value _type' (or there is no acceptable conversion) with [ Tag=boost::vertex_name_t, Graph=boost::detail::subgraph_any_pmap::bind_::Property>::Graph,

Property=boost::detail::vertex_property_map

map::bind_

...

ver tex_property_mapboost::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@pisem.net | ------------------------------------- _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

_______________________________________________ Jeremy Siek http://www.osl.iu.edu/~jsiek Ph.D. Student, Indiana University Bloomington C++ Booster (http://www.boost.org) Office phone: (812) 856-1820 _______________________________________________

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------------------------------------- |your sincerely, Maxx, | | mailto:maxxua@pisem.net | -------------------------------------