Re: Dawn doesn't like 1NF
Date: Sat, 16 Oct 2004 09:28:42 -0400
Message-ID: <RrSdneqA5o2Kv-zcRVn-hQ_at_comcast.com>
"Marshall Spight" <mspight_at_dnai.com> wrote in message
news:aw8cd.268503$3l3.89210_at_attbi_s03...
> If you don't expose pointers at the logical level, you don't have
What follows is more thread drift, but what the heck!
I've wondered whether Object Oriented systems distinguish between a "copy"
of an object and a "clone" of an object.
Here's what I mean: a copy of an object has the same class and the same
state, but a different identity. The two objects can interact with each
other, exchanging information, yada, yada. Over time, their states will
diverge.
A "clone" of an object had the same class, same state, and same identity,
but a different location. Maybe the clone has been put "on ice" in a backup
file, in case the object itself gets trashed.
If the clone and the original ever start acting in the same object world,
trouble happens. Even if they don't directly impact each other, they are
going to mess with the other objects in the world!
I'm just a babe in the woods when it comes to OO. Does the above even make
> to have identity comparison in your system.