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From: Duncan Sands <baldrick@free.fr>
Newsgroups: comp.lang.ada
Subject: Re: Hashing on System.Address
Date: Wed, 15 Jun 2005 09:13:13 +0200
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Date: 2005-06-15T09:13:13+02:00

> >      The various Hash functions should be good hash functions, returning a
> wide spread of values for different string values. It should be unlikely for
> similar strings to return the same value.
> >
> > As if any implementor needs to be told that they should use a "good"
> rather than a "bad"
> > hash function!
> 
> We'd have preferred to say something stronger, and normatively, but there
> doesn't seem to be a way to describe what a hash function does, other than
> returning a value of Hash_Type that depends of the argument. So we use IA to
> describe what the intent is; IA can be informal and use undefined terms like
> "good".
> 
> Without the IA, the only indication that this is a hash function is the
> name. That wouldn't be enough. And if you don't know what a hash function
> is, the IA will be helpful.

How about this then:

"The various Hash functions should return a wide spread of values for different
string values. It should be unlikely for similar strings to return the same value."

Ciao,

D.