Re: [Boost-users] [BGL] unordered_set<std::vector<edge_descriptor> >

Subject: Re: [Boost-users] [BGL] unordered_set<std::vector<edge_descriptor> >
From: Andrew Sutton (andrew.n.sutton_at_[hidden])
Date: 2009-04-29 12:58:06

>
> I want to keep a set of paths, which are implemented as a vector of
> edge_descriptor. I don't care about the order. I just have to add
> paths and be able to know the number of different paths present in the
> set.
>
> So, I plan to use unordered_set but I'd like to know you opinion about
> a hash function, since AFAIK, unordered_set is like an hash_set?
>
> My main issue is to use as few memory as possible, because there will
> have a lot of paths in the set. Any idea?

How many is a lot? Do you know the number before hand?

If the order really doesn't matter and  you don't need the associative
properties of a hash table, I'd stick with a list. for forward_list (for
less memory, but no reverse iteration).

Andrew Sutton
andrew.n.sutton_at_[hidden]