The replacement method, BoolExpression, accepts a
BoundedLinearExpression directly, and uses memoization to reuse Boolean
variables. This technique is unsuitable for other methods, as
constraints need to be applied separately, but in this case it is fine.
The new method is much easier to understand, and far easier to read at
call sites.
Variable names are generated from the expression, rather than being
explicitly specified.
The new subclass, BoneMarketModel, overrides CpModel's methods with
improvements such as default parameters and support for enforcement
literals.
This should allow substantial improvements to the readability of the
solver in the future.
In addition, various lists have been replaced with tuples where
appropriate.
Jeremy Saklad