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

8 Feb 2005

      Excuse me, I don't use graph properties, though I suspect they behave the same 
as edge and vertex properties as far as subgraphs go.

What I can provide is the class that I used to wrap subgraphs.
The inner VertexData and EdgeData classes provide operator[] and iterator 
interfaces.  Look at the implementation of these methods to see the boost::get 
usage.

This was developed for boost 1.31.1.  I know that things have improved somewhat 
in this area, but believe the subgraph/property things remain the same.

Gordon Smith wrote:
...
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"  wrote in message
news:cubfff$8mt$1@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 
#include 
#include 
int
main()
{
using namespace boost;
using std::string;
typedef adjacency_list,
property > graph_t;
graph_t g;
get_property(g, graph_name) = "graph";
std::cout << "name: " << get_property(g, graph_name) << std::endl;
typedef subgraph 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;
}