[Cbc] Cut generators depending on upper bounds

[John Forrest]

Thomas,

Trivial to do it with current Cbc release.

regards

John Forrest

--------
However I suppose you would like a bit more detail.

Two ways come to mind.

a) Pass in current CbcModel in CglXxxxx constructor and use
CbcModel::bestSolution() for values (NULL if no solution) and
CbcModel::getObjValue().

b) If you don't want Cbc in your Cgl -

pass in a CbcEventHandler and check for solution or heuristicSolution
event (see Cbc/examples/drievr4.cpp).  When that happens go through cut
generators and use dynamic_cast to pick up CglXxxxx and pass in values.





On Fri, 2010-04-30 at 13:04 +0200, Thomas Schoenemann wrote:
> Dear all,
> 
> I want to write a column cut generator that needs to know the best known upper 
> bound (i.e. the cost of the best known integral solution). Is there any way to 
> achieve that with the current Cbc-release?
> 
> If not, I think it would be a useful feature. In combination with special 
> ordered sets (of binary variables) one could probably define a general purpose 
> cut generator.
> 
> Best regards,
>   Thomas
> 
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