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Hashes in U++ [message #2026]

Thu, 30 March 2006 02:38

Justin
Messages: 57
Registered: March 2006
Location: Orange County California

Member

If NTL replaces STL, how would I go about working with Hashes?

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Re: Hashes in U++ [message #2048 is a reply to message #2026]

Thu, 30 March 2006 22:10

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

Justin wrote on Wed, 29 March 2006 19:38

If NTL replaces STL, how would I go about working with Hashes?

Now I am not sure what is this question about... As you most likely know, STL (as defined in std:: library) does not have hash tables.

On opposite, all NTL associativity is based on hashes.

Now, if you ask about how to make your type "associative" in NTL:

- provide it with operator==

- define a GetHashValue either as external function or as method.

To define GetHashValue - most U++ values have GetHashValue defined, so make hash value of all components and then use CombineHash to get single hash value (well, you can sum or xor them together too, but CombineHash might provide slightly less conflicts).

There is a reference/Common that demostrates such common lower level practices of U++.

Mirek

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