[gecode-users] view selection combinator
Martin Mann
mmann at informatik.uni-freiburg.de
Thu Nov 23 00:35:12 CET 2006
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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