[m-users.] The new random module(s)
jfondren at minimaltype.com
Thu Sep 5 14:30:48 AEST 2019
With a recent rotd you may notice some new warnings:
Warning: call to obsolete predicate `random.init'/2.
This module now offers a typeclass and several random number generators.
That's very cool! Using typeclasses and multiple generators is the very
first thing I wanted to fix with Mercury's stdlib, some years ago before
I got pulled into other things instead.
One benefit to the new code is that you don't need to use the FFI (or
read from a random device) just to get a random seed.
But my code is still a little weird:
random.generate_uint64(Seed, random.sfc16.init, _), % new stuff
random.init(uint64.cast_to_int(Seed), RS), % old stuff
fifteen.shuffled(Board, RS, _),
Why the mix? array.random_permutation and random.permutation have been
left behind, and only work with a random.supply.
The change also means that I'll have to add a "works with" version
warning to this code when I submit it to RosettaCode, since it'll fail
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