[gecode-users] view selection combinator

[Grégoire Dooms]

Great, I need this.
I would call V2 a tie-breaking strategy for V1.
Best,
--
Greg.

Martin Mann wrote:
> Hello,
>
> I had the idea to write a hierarchical combinator VC (will be a 
> viewselector itself) for two ViewSelectors V1 and V2, that does the 
> following: for a view v it first asks V1 about v. if V1 says "better" 
> v is accepted (VC returns VSS_SELECT). if V1 says "equal" VC asks V2 
> about v. if V2 says "better" v is accepted by VB else rejected or 
> "equal" returned.
>
> The application is a free combination of existing view selections for 
> test reasons and to find the best view selection for my problem. I 
> think this is something other may be interested in too. For instance 
> you ve got a fast V1 for a first ordering and a more expensive V2 for 
> a detailed selection. a combinator would be great, because otherwise 
> you ve got to apply the expensive V2 always to all views.
>
> Now comes my problem: the possible return values of ViewSelectors:
>
> enum      Gecode::ViewSelStatus {
>    Gecode::VSS_NONE,   // not better
>    Gecode::VSS_SELECT, // is better
>    Gecode::VSS_COMMIT  // is the best ever
> }
>
> i ve got no possibility to get or return the information "is as good 
> as last best seen". as far as i can see it wont be a big deal to 
> introduce this into the enum and the existing standard viewselectors 
> if you think that it is worthy. e.g. as second a VSS_ALIKE. by that 
> you wont change your interface and no changes in the branchings are 
> neccessary.
> I can send you the template code of the combinator when its done if 
> you like the idea.. ;)
>
> maybe the "alike" information can be usefull somewhere else too. but 
> right now i ve got no further good idea.
>
> thanks for interest,
>
> martin
>
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