Is it possible to use a callback when an integer solution is found?

[joelmontoy]

Hello!
I've used CoinMP libraries to solve integer programs before, but now I'm using Sonnet because I love the modelling syntax.
However, sometimes I would like to use callbacks like I could in CoinMP, specially the one that is called when an integer node is found (NodeCallback).
Is there a way to use CBC callbacks in Sonnet?
Thanks!

[jhmgoossens]

Have a look at the Sonnet_CbcTest5 and the eventhandler used there. Does this help?

[joelmontoy]

Yes, it definitely helps. Thank you!
However, I get an error saying that enums CbcEvent and CbcAction are not defined in the COIN namespace...
But this is a different problem. I'll try to solve it and I'll open another discussion if I can't!

[jhmgoossens]

Great! Hint: You need to include using COIN; for these, same as done near the top of the Sonnet_CbcTests.cs file.

[joelmontoy]

Solved! I had to build the binaries from source. It seems that the precompiled binaries of SonnetWrapper (version 1.4) didn't include CbcEventHandler. Many thanks!