[Boost-users] Re: BGL + Subgraph + Propertymap issue...

From: Gordon Smith (schmoo2k_at_[hidden])
Date: 2005-02-08 17:53:36

I am not sure I follow - I am specifically talking about "graph_name_t" type
properties (not vertex or edge properties) - can show a code snippet of how
you get a reference to one for a specific subgraph?

TIA,

Gordon.

"Jeffrey Holle" <jeff.holle_at_[hidden]> wrote in message
news:cubfff$8mt$1_at_sea.gmane.org...
> The answer is no.
> The way I had to employ internal properties with subgraph is to use the
root.
> method of the subgraph class to access the properties of the root graph.
> Note that the local to global vertex/edge index methods must also be used.
>
> The subgraph does have properties, just not the same as the roots.
>
> Gordon Smith wrote:
> > The following example produces the following (unexpected results):
> > name: graph
> > name: subgraph 1
> > name sg2: subgraph 2
> > name sg: subgraph 2
> >
> > Do subgraphs share the same property_map?
> >
> > Gordon.
> >
> > // SubGraphPropertyTest.cpp : Defines the entry point for the console
> > application.
> > //
> > #include "stdafx.h"
> > #include <string>
> > #include <iostream>
> > #include <boost/cstdlib.hpp>
> > #include <boost/graph/adjacency_list.hpp>
> > #include <boost/graph/subgraph.hpp>
> > int
> > main()
> > {
> > using namespace boost;
> > using std::string;
> > typedef adjacency_list<vecS, vecS, directedS,no_property,
> > property<edge_index_t, int>,
> > property<graph_name_t, string> > graph_t;
> > graph_t g;
> > get_property(g, graph_name) = "graph";
> > std::cout << "name: " << get_property(g, graph_name) << std::endl;
> > typedef subgraph<graph_t> subgraph_t;
> > subgraph_t sg;
> > get_property(sg, graph_name) = "subgraph 1";
> > std::cout << "name: " << get_property(sg, graph_name) << std::endl;
> > subgraph_t sg2 = sg.create_subgraph();
> > get_property(sg2, graph_name) = "subgraph 2";
> > std::cout << "name sg2: " << get_property(sg2, graph_name) << std::endl;
> > std::cout << "name sg: " << get_property(sg, graph_name) << std::endl;
> > return exit_success;
> > }