Selective channeling for Exact#1000
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OrestisLomis wants to merge 19 commits into
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why is it so special? pindakaas (pb interface) uses ivarmap and all is fine, if we didn't do that in exact yet, can't you just... do it exactly the same way? |
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I agree the helper functions were kind of unnecessary and I removed them, but otherwise there is not much special going on. |
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When an integer variable is encoded (for now only directly, but with #994 this can also be orderly) a solver without an ivarmap (so any non-SAT solver) will post both defining
sum(bvs) == 1as well as channelingwsum(ws, bvs) == ivto the solver. However, the channeling constraints are not necessary when theivis not actually used in any constraint or the objective. This PR adds an ivarmap to Exact and allows for selective posting of channeling constraints, i.e. only when actually necessary.