Query/set the state of the random generator. This is intended
for restarting the generator at a known state only. The
predicate setrand/1 accepts an opaque term returned by
getrand/1. This term may be asserted, written and read. The
application may not make other assumptions about this term.
For compatibility reasons with older versions of this library,
setrand/1 also accepts a term
rand(A,B,C), where A, B and C are
integers in the range 1..30,000. This argument is used to seed
the random generator. Deprecated.
existence_error(random_state, _) is raised if the
underlying infrastructure cannot fetch the random state.
This is currently the case if SWI-Prolog is not compiled
with the GMP library.
- See also
- - set_random/1 and random_property/1 provide the SWI-Prolog