Re: [boost] Boost Trie

From: chintan rao (chintanraoh_at_[hidden])
Date: 2008-03-25 08:15:24

Hi,
Finally some bad discovery was made.........
http://gcc.gnu.org/onlinedocs/libstdc++/ext/pb_ds/trie_based_containers.html

There seems to be a PATRICIA trie implementation in libstdc++ in 4.3
and 4.2implementations
Please suggest modifications to my application.

Regards,
Chintan Rao H

On Tue, Mar 25, 2008 at 8:41 AM, chintan rao <chintanraoh_at_[hidden]> wrote:

>
>
> On Tue, Mar 25, 2008 at 7:29 AM, Scott McMurray <me22.ca+boost_at_[hidden]>
> wrote:
>
> > On Mon, Mar 24, 2008 at 9:30 PM, chintan rao <chintanraoh_at_[hidden]>
> > wrote:
> > >
> > >  PATRICIA Tries optimize space. I don't know about how much it
> > improves  the
> > >  time efficiency over normal tries as one could be using TST in it to
> > >  conserve space. But as far i remember a person #boost channel
> > reported some
> > >  thing like 2x speed over std::map.
> > >
> >
> > (I use PATRICIA to mean joining chains of nodes with only one outbound
> > link.  Whether that's right not no, I don't know.)
> >
> > I expect the time efficiciency improvement isn't significant.  It's
> > probably similar to the difference between iterating list and vector,
> > in that the memory locality is better.  It's essential, as far as I'm
> > concerned, though, to keep the node space overhead from getting
> > excessive, particularly since it does not worsen the time costs.
> >
> > And that "person in #boost" was likely me.  I got roughly a 2x speed
> > up for 2x the memory cost, in a non-generic, proof-of-concept
> > tst-patricia-trie.
>
> Must have been you. You had spoken about tst patricia trie.  :).
>
> >
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>