Re: [Boost-users] randomize_property question

Subject: Re: [Boost-users] randomize_property question
From: mcorbion_at_[hidden]
Date: 2009-08-14 12:53:48

Ok so I still can't use the randomize property but I've done a workaround.
I created an AbstractGraph class which has a m_Graph adjacency_list type
of graph. And nodes uses the bundled property :
struct City
{
  int pos_X;
  int pos_Y;
};

My workaround test function uses the property map given to randomly set
the values, but it's still too specific :

template <typename Graph, typename BundProp,typename RandomGenerator>
void  AbstractGraph::test(bundle_property_map<Graph,unsigned
int,BundProp,int> p_PMap, RandomGenerator& p_ewrg){

    AbstractGraph::N_iterator l_NodeStart;
    AbstractGraph::N_iterator l_NodeEnd;
    AbstractGraph::GetNodes(l_NodeStart,l_NodeEnd);

    for (; l_NodeStart != l_NodeEnd; ++l_NodeStart) {
        p_PMap[*l_NodeStart] = p_ewrg();
    }
}

called this way in the main :

    mt19937 l_Gen(1988);
    boost::uniform_int<> RandRange(1,10);
    boost::variate_generator<boost::mt19937&, boost::uniform_int<> > 
ew2rg(l_Gen, RandRange);

    typedef property_map<Graph, int(City::*)>::type t_PMapCity;
    t_PMapCity l_PMap=get(&City::pos_X,m_Graph);
    test<Graph,City>(l_PMap,ew2rg);

I would like to include the two line that generates the property_map from
the main to the test function. I've tried this :

template <typename Graph, typename PropertyTagType,typename RandomGenerator>
void  AbstractGraph::test2( ??? p_PropertyTagName,RandomGenerator& p_ewrg){

    typedef property_map<Graph, PropertyTagType>::type t_PMap;
    t_PMap l_PMap=get(PropertyTagName,m_Graph);
    AbstractGraph::N_iterator l_NodeStart;
    AbstractGraph::N_iterator l_NodeEnd;
    AbstractGraph::GetNodes(l_NodeStart,l_NodeEnd);

    for (; l_NodeStart != l_NodeEnd; ++l_NodeStart) {
        p_PMap[*l_NodeStart] = p_ewrg();
    }
}

called this way :

    test2<Graph,int(City::*)>(l_Gen, &City::pos_X);

But I can't figure any type for &City::pos_X in order to write the header
for test2 allowing the function to work with float, char ...

Thanks in advance
M.CORBION