From: Duncan Sands <baldrick@free.fr>
To: comp.lang.ada@ada-france.org
Cc: Matthew Heaney <matthewjheaney@earthlink.net>
Subject: Re: Hashing on System.Address
Date: Tue, 14 Jun 2005 09:27:33 +0200
Date: 2005-06-14T09:27:33+02:00 [thread overview]
Message-ID: <mailman.23.1118734073.17633.comp.lang.ada@ada-france.org> (raw)
In-Reply-To: <u8y1dllt8.fsf@earthlink.net>
> Good idea. The other thing I haven't really figured out is what to do
> if you have a 64-bit address, and Hash_Type is only 32. Ideally you'd
> like to compute a 32-bit hash value that uses all 64 bits of the
> address.
Yes, that's the problem. In fact to be portable the code should work
regardless of which type has the bigger modulus.
> Alternatively, you could use the ordered container, since type
> System.Address has a less than ("<") relational operator.
I considered that, but since I'm sure to want to hash on addresses one
day, it seemed like a good idea to bite the bullet and come up with a
good solution now.
By the way, is there any reason why Ada.Containers doesn't provide some
standard hash functions? I reckon hashing on strings and on addresses
would be pretty handy.
Ciao,
Duncan.
next prev parent reply other threads:[~2005-06-14 7:27 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-13 20:18 Hashing on System.Address Duncan Sands
2005-06-13 21:31 ` Mark Lorenzen
2005-06-14 7:23 ` Duncan Sands
2005-06-14 20:18 ` Randy Brukardt
2005-06-15 7:27 ` Duncan Sands
2005-06-13 21:57 ` Matthew Heaney
2005-06-13 23:41 ` Robert A Duff
2005-06-14 2:22 ` Matthew Heaney
2005-06-14 7:27 ` Duncan Sands [this message]
2005-06-14 8:52 ` Alex R. Mosteo
2005-06-14 9:06 ` Duncan Sands
2005-06-14 9:09 ` Duncan Sands
2005-06-14 17:00 ` Pascal Obry
2005-06-14 20:03 ` Randy Brukardt
2005-06-14 23:20 ` Robert A Duff
2005-06-15 7:13 ` Duncan Sands
2005-06-14 8:44 ` Larry Kilgallen
2005-06-14 10:03 ` Marius Amado Alves
[not found] ` <abb2a2c53e3708803aa68bb87834b7bc@netcabo.pt>
2005-06-14 10:14 ` Duncan Sands
[not found] ` <200506141214.14213.baldrick@free.fr>
2005-06-14 10:29 ` Marius Amado Alves
[not found] ` <64f19b6707e4d19f5362900bbfb80b76@netcabo.pt>
2005-06-14 10:49 ` Marius Amado Alves
2005-06-14 8:42 ` Larry Kilgallen
2005-06-14 11:18 ` Duncan Sands
2005-06-14 7:18 ` Duncan Sands
2005-06-14 15:18 ` Matthew Heaney
2005-06-14 16:22 ` Duncan Sands
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