Re: [Boost-users] Regarding property maps

Subject: Re: [Boost-users] Regarding property maps
From: Rohith Reddy (rohithrockzzz_at_[hidden])
Date: 2015-09-23 01:53:33

Hey alex,
     Thanks a lot for the reply.That worked for me.But can you help me
understand the following in your code,

1.Second argument of the constructor,
member_property_map(Map map, Type bundle_type::* member)
      : m_map(map), m_member(member)
    {}

2.What does the put_get_helper class actually do?

Thanks in advance.

On Tue, Sep 22, 2015 at 5:44 PM, alex <alexhighviz_at_[hidden]> wrote:

> >Rohith Reddy wrote:
> > I have been working on a graph using boost graph library with edge
> >properties as bundled properties.I have the following struct as my edge
> >property,
> >
> >typedef struct Edge{
> >int id;
> >int source;
> >int target;
> >float cost;
> >float reverse_cost;
> >} Edge;
> >
> >    Provided that I am inserting the data correctly,how do I get a
> property map
> >for each of the elements of the struct,that is a property map for id,a
> property
> >map for the source and so on.And moreover I also want to know how to
> extract
> >the type of property map,as it is required to pass its type to other
> function as a
> >template parameter.
> >
> >Thanks in advance.
>
> I had the same problem and developed a member_property_map to access the
> member of a bundled map.
>
> It allows the following:
>
>   typedef boost::vector_property_map<edge> bundle_map_type;
>   typedef blink::member_property_map<bundle_map_type, float> cost_map_type;
>
>   bundle_map_type bundle_map;
>   cost_map_type cost_map(bundle_map, &edge::cost);
>
> See attached for the implementation and example.
>
>
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