Jan Burse, created Mar 03. 2020
* We provide a couple of additional bitwise operations. The evaluable
* functions setbit/2 and clearbit/2 update the given integer in a
* more efficient way than would be possible with existing logical
* and shift operations:
* ?- testbit(-100,3).
* ?- testbit(100,3).
* The predicate testbit/2 tests a particular bit in a given integer, again
* the implementation is more efficient than would be possible with
* existing logical, shift and test operations. The evaluable functions
* and the predicate require a positive or zero shift.
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* setbit(X, Y, Z):
* If X and Y are integers than the function returns X \/ (1 << Y).
* clearbit(X, Y, Z):
* If X and Y are integers than the function returns X /\ \ (1 << Y).
* testbit(X, Y):
* The predicate succeeds when X /\ (1 << Y) =\= 0.