Re: [Boost-users] [PropertyMap, Graph] Question on constructing a property map from a Cartesian product AxB of two sets to the set C of all real numbers

Subject: Re: [Boost-users] [PropertyMap, Graph] Question on constructing a property map from a Cartesian product AxB of two sets to the set C of all real numbers
From: Alex Sadovsky (a_sadovsky_at_[hidden])
Date: 2012-06-13 15:09:55

Reply to boost-users_at_[hidden]


________________________________
 From: Jeremiah Willcock <jewillco_at_[hidden]>
To: "boost-users_at_[hidden]" <boost-users_at_[hidden]> 
Sent: Wednesday, June 13, 2012 11:10 AM
Subject: Re: [Boost-users] [PropertyMap, Graph] Question on constructing a property map from a Cartesian product AxB of two sets to the set C of all real numbers
 
On Tue, 12 Jun 2012, Alex Sadovsky wrote:

> Hello,
> 
> I have defined a directed graph type, and a path type (each variable of type "path" is a sequence (vector) of vertices in the graph such that every two consecutive ones are connected by an edge).  Each path is parameterized by arc length.
> 
> What I'd like to do is tabulate the function that, for each pair (vertex, path) tells the arc length coordinate of the vertex.  I don't want to make it a function: a pair (vertex, path) is likely to come up more than once, and I want to avoid repeating the computation of the arc length coordinate.  Just compute it once and store it in a property map.

Where are you storing the paths?  Are they attached to vertices?  They don't appear to be from the definitions below.  Are you going to be using all of the <vertex, path> pairs' arc length values?  I don't think I fully understand what you're asking---why do you want to store your data in a property map?  What are you thinking of as the keys of the property map? Vertices, or <vertex, path> pairs, or something else?

-- Jeremiah Willcock
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