Add .choices() method to the Slice distribution

[JustusFluegel]

• Added a CHANGELOG.md entry

Summary

Add a .choices() -> NonZeroUsize method to the slices distribution

Motivation

In one of my projects we use a Slice Distribution for the input of a constructor for a type which needs to generate some element of that slice & at the same time a boolean for another variable with the same probability of each element in the Distribution occurring. A simple 1 / distr.choices() would help us a lot in that regards.

Details

Adds the Slices::choices() - NonZeroUsize method, which returns the count of different choices in the input vector (counting duplicates in that vector as well)

[JustusFluegel]

I am not quite sure if that changelog format I am using here is correct so I would appreciate someone looking over that and giving me a short reply :)

[JustusFluegel]

Sorry I kinda messed up my commits here, wanted to keep a clean history so force-pushed to my branch ( shouldn't really matter on your end either way )

[dhardy]

No worries about commit history; we squash in this repo. (Personally I still force-push often enough.)

[dhardy]

A little unorthodox, but seems fine to me. 👍

[MichaelOwenDyer]

Looks good to me

[dhardy]

CI failure is a false positive from the new non_local_definitions lint; leave for now.

[JustusFluegel]

CI failure is a false positive from the new non_local_definitions lint; leave for now.

yep I figured :)

[JustusFluegel]

Is there some information on the release cycle of rand somewhere ( Is there a date when this will be in alpha / stable )? Don't want to push you to release something, just some information on when I should check back here would be nice :)

[dhardy]

There's a tracking issue for 0.9. We're a little slow making releases, but I'll push out a second alpha soon.

[JustusFluegel]

thanks 👍