Generate A Good Hash Key

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Generate A Good Hash Keyboard

P: n/a
I've thought a bit about the issue with hashcodes.
I use hashtables and I suppose that they use the GetHashcode function to
determine the identity of the objects stored. Then I thought that the
GetHashcode would have to return an unique number for every possible object
if I am to use it as key in the hashtable.
I've seen a few implementations on the internet looking like this:
Class C
{
public int propertyA;
public int propertyB;
public override GetHashcode()
{
return propertyA.GetHashcode ^ propertyB.GetHashcode;
}
}
Whould the bitwize OR generate unique hashcodes for objects with all
possible combinations in propertyA and propertyB?
In my current application there are several types of objects that inherit
from a base class that we've written. They are stored in a database and have
a primary key combined from two values in the database. The two values are
object id and version number.Then they have sveral other properties such as
name, createdByUserId, createTimeStamp, updateTimeStamp.
My guess is that I could write a GetHashcode function in the base class
looking like this:
GetHashcode()
{
return (typeof(this)).GetHashcode() ^ this.objectId ^
this.versionNumber();
}
Would this be a good implementation?
Are there any resources which sumarize how to quickly write *good*
GetHashcode() functions?
thanks for the help!
/mortb
'Marc Gravell' <mg******@rm.com> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl..
If you mean unique per instance, then the only guaranteed way that I know
of is to have something unique in each instance - a simple static int
counter (along with an instance field) would suffice, where each instance
(in the instance ctor) gets the next value and increments the static
counter (pref. using thread-safe increment).
*however* Assuming your hash would be Int32, you are then limited to 2^32
objects - otherwise then can't be unique! (assuming no complex code to
recycle numbers)
You could implement this either as an abstract base class, but then your
*total* instances (of subtypes of this) would be limited to 2^32.
Is it actually required that they be unique? Although not unknown, this is
not (to my mind) recommended usage for a hash value?
Marc