All,
First, I'm very new to boost and BGL, so please forgive me if this is trivial.
I've created a graph (adjacency_list) using bundled properties and am now
trying to write it as a dot file. I've written my property writer, but when
I compile, I get several of:
/usr/include/boost/graph/graphviz.hpp: In function `void
boost::write_graphviz(std::ostream&, const Graph&, VertexPropertiesWriter,
EdgePropertiesWriter, GraphPropertiesWriter, VertexID) [with Graph =
boost::adjacency_list,
VertexPropertiesWriter = map::placeWriter, EdgePropertiesWriter =
boost::default_writer, GraphPropertiesWriter = boost::default_writer,
VertexID =
boost::adj_list_vertex_property_map, boost::detail::error_property_not_found, const
boost::detail::error_property_not_found&, boost::vertex_index_t>]':
/usr/include/boost/graph/graphviz.hpp:260: instantiated from `void
boost::write_graphviz(std::ostream&, const Graph&, VertexPropertiesWriter,
EdgePropertiesWriter, GraphPropertiesWriter) [with Graph =
boost::adjacency_list,
VertexPropertiesWriter = map::placeWriter, EdgePropertiesWriter =
boost::default_writer, GraphPropertiesWriter = boost::default_writer]'
/usr/include/boost/graph/graphviz.hpp:278: instantiated from `void
boost::write_graphviz(std::ostream&, const Graph&, VertexWriter) [with Graph
= map::mapType, VertexWriter = map::placeWriter]'
topologicalMap.h:282: instantiated from here
/usr/include/boost/graph/graphviz.hpp:241: error: no match for 'operator<<' in
'out << boost::get [with PropertyMap =
boost::adj_list_vertex_property_map, boost::detail::error_property_not_found, const
boost::detail::error_property_not_found&, boost::vertex_index_t>, Reference =
const boost::detail::error_property_not_found&, K = void*](((const
boost::put_get_helper, boost::detail::error_property_not_found, const
boost::detail::error_property_not_found&, boost::vertex_index_t> >&)((const
boost::put_get_helper, boost::detail::error_property_not_found, const
boost::detail::error_property_not_found&, boost::vertex_index_t> >*)
((boost::put_get_helper, boost::detail::error_property_not_found, const
boost::detail::error_property_not_found&, boost::vertex_index_t> >*)
(&vertex_id)))), ((void* const&)((void* const*)
(+(&i)->std::_List_iterator<_Tp>::operator* [with _Tp = void*]()))))'
/usr/lib/gcc/x86_64-pc-linux-gnu/3.4.5/include/g++-v3/bits/ostream.tcc:63:
note: candidates are: std::basic_ostream<_CharT, _Traits>&
std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT,
_Traits>&(*)(std::basic_ostream<_CharT, _Traits>&)) [with _CharT = char,
_Traits = std::char_traits<char>]
Not being very good at deciphering all that, I'm not sure what is happening.
I do understand that it's missing an extraction operator but I'm not sure on
what. The actual line in graphviz.hpp is:
out << get(vertex_id, *i);
Two questions:
- Could somebody tell me exactly what that get returns?
- From the dot format, this should be the name of the vertex in the dot file.
So this seems to relate to the class used as a property. My second question
is then: If this is the case, why then do we need the property writer since
we apparently also need the operator<< that could do exactly the same thing?
(And isn't a ' ' (space) missing between the vertex name and whatever the
property writer writes (or should that be included in it, which is not
mentioned by the documentation)? That was 3 questions then ;-)
Thanks in advance for any replies.
Cheers,
Fred
