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Proposal on *Index: access via hash value [message #20678]

Tue, 31 March 2009 13:37

Mindtraveller
Messages: 917
Registered: August 2007
Location: Russia, Moscow rgn.

Experienced Contributor

Recently I`ve rewritten a number of classes from VectorMap towards heavily Index usage. But IMO this class lacks access by hash value. To show why it is important I`ll give an example of typical situation.
Let`s imagine I have a number of CollectionElement class objects. Each object is identified by it`s unique value. Hash value is derived from this unique id. I do also have a number of another objects which contain information based on CollectionElement-s. To keep this system serializable, I refer to CollectionElements by their unique ids. The problem arises when I try to get requested object by this id. *Index class has no means to reach object by it`s hash. Once found, I would certainly use FindNext() - so multi-keying isn`t problem here.
You may say that there`s a *Map class, and it gives me access by id value. But IMO in this sutiation it is more than needed. Using *Map will make me duplicate keys: internal CollectElement object id is duplicated as the *Map key. It doesn`t seem quite well.
May be it will be really iseful to add something like
bool AIndex::Check(unsigned _hash);
int AIndex::FindFirst(_hash);
?

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[Message index]

		Proposal on *Index: access via hash value By: Mindtraveller on Tue, 31 March 2009 13:37
		Re: Proposal on *Index: access via hash value By: mirek on Tue, 31 March 2009 14:01
		Re: Proposal on *Index: access via hash value By: Mindtraveller on Tue, 31 March 2009 15:04
		Re: Proposal on *Index: access via hash value By: mirek on Tue, 31 March 2009 15:23
		Re: Proposal on *Index: access via hash value By: mrjt on Tue, 31 March 2009 16:21
		Re: Proposal on *Index: access via hash value By: Mindtraveller on Tue, 31 March 2009 20:17
		Re: Proposal on *Index: access via hash value By: mirek on Wed, 01 April 2009 05:26
		Re: Proposal on *Index: access via hash value By: mrjt on Wed, 01 April 2009 09:49

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