Re: Designing a hashing function in C++

From:
"Igor Tandetnik" <itandetnik@mvps.org>
Newsgroups:
microsoft.public.vc.language
Date:
Tue, 24 Jun 2008 08:17:25 -0400
Message-ID:
<#V0tERf1IHA.3920@TK2MSFTNGP02.phx.gbl>
"Jack" <jl@knight.com> wrote in message
news:OKS4SJf1IHA.2384@TK2MSFTNGP04.phx.gbl

What is the general approach to design a hashing function without
collisions?


There ain't no such thing. The whole point of a hash function is to
map a large number of possible values to a smaller number of keys.
Since there are more values than keys, you would necessarily have
collisions.


which means hash functions can be very general? :)


I'm not familiar with the term "general function". I don't understand
this question (nor do I get the joke, assuming it was one as the smiley
seems to indicate).

as I've seen different algorithms to implement a hashing function...
correct me if I am wrong....


How would I know whether or not you have seen different algorithms? If
you say you did, I have no reason to doubt you.
--
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    Igor Tandetnik

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