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

From: Jeffrey Holle (jeff.holle_at_[hidden])
Date: 2005-02-08 17:47:33

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;
> }