Re: [Boost-users] PropertyWriter problem - how to handle a boost::shared_ptr type

From: Stephen torri (storri_at_[hidden])
Date: 2004-11-08 13:10:35

On Mon, 2004-11-08 at 11:32, Doug Gregor wrote:
> A property writer is passed the output stream and the descriptor, so 
> you want to write Component_Writer like so:
> 
> class Component_Writer {
> public:
>    typedef boost::graph_traits<Graph_Type>::vertex_descriptor 
> Vertex_Type;
> 
>    Component_Writer(const Graph_Type& g) : g(g) {}
> 
>    void operator()(std::ostream& out, Vertex_Type v)
>    {
>      boost::shared_ptr<Component> obj_ptr = get(vertex_name, g, v);
>      // code from before...
>    }
> };
> 

Ignore previous email. My graph stores the parent type, Component, while
the actual type is either A or B. So my ability to store them by the
Component type alone will not work since the class contains a pure
virtual function.

Its still balking at compile time. I have changed the Component_Writer
but I get the following compile error. The file is attached.

Stephen

------------------

g++ -g -Wall -o graph_test2 graph_test2.cpp
/usr/include/boost/graph/graphviz.hpp: In function `void 
   boost::write_graphviz(std::ostream&, const Graph&,
VertexPropertiesWriter, 
   EdgePropertiesWriter, GraphPropertiesWriter) [with Graph = 
   boost::adjacency_list<boost::setS, boost::setS, boost::directedS, 
   boost::property<boost::vertex_index_t, uint32_t, 
   boost::property<boost::vertex_name_t, boost::shared_ptr<Component>, 
   boost::no_property> >, boost::no_property, boost::no_property, 
   boost::listS>, VertexPropertiesWriter = Component_Writer, 
   EdgePropertiesWriter = boost::default_writer, GraphPropertiesWriter =
   boost::default_writer]':
/usr/include/boost/graph/graphviz.hpp:292:   instantiated from `void
boost::write_graphviz(std::ostream&, const Graph&, VertexWriter) [with
Graph = boost::adjacency_list<boost::setS, boost::setS,
boost::directedS, boost::property<boost::vertex_index_t, uint32_t,
boost::property<boost::vertex_name_t, boost::shared_ptr<Component>,
boost::no_property> >, boost::no_property, boost::no_property,
boost::listS>, VertexWriter = Component_Writer]'
graph_test2.cpp:499:   instantiated from here
/usr/include/boost/graph/graphviz.hpp:264: error: no match for call to
`(
   Component_Writer) (std::basic_ostream<char, std::char_traits<char>
>&, void* 
   const&)'
graph_test2.cpp:260: error: candidates are: void 
   Component_Writer::operator()(std::ostream&, void*&) const

-- 
Email: storri_at_[hidden]