Add iter_allocated_chunks_raw()

[poconn]

Adds iter_allocated_chunks_raw(), which (a) yields raw (*mut u8, usize), and (b) only borrows the arena immutably.

Fixes #121, follow-up from PR #126 (posting a new one as all of the previous changes would be reverted)

I need to finish the docs and add tests, posting just to get confirmation on this approach first.

Thanks!

[fitzgen]

Yeah this looks good.

Can you add some smoke tests for iteration as well? Maybe a quickcheck that allocates a bunch of things, records the ranges where the things are allocated, and then makes sure that every allocated thing is within one of the chunks as returned by iter_allocated_chunks_raw? See tests/quickchecks.rs for the other quickchecks, which should give you an idea of how to write this kind of test.

Thanks!

[poconn]

Added smoke tests. No unit tests, but hopefully the existing iter_allocated_chunks() test cases along with the added chunks_and_raw_chunks_are_same() provide sufficient coverage? (especially considering that the old method now just wraps iter_allocated_chunks_raw())

[fitzgen]

Tests look great!

Couple nitpicks below and then this should be ready to merge.

Thanks!

[fitzgen]

Thanks!

[poconn]

Thanks @fitzgen! If it's not too much trouble, we'd really appreciate if you could release a new version with the changes, please? :) (no hurry if you have other pending changes, just whenever is convenient)

[fitzgen]

Published!

[poconn]

Great, thanks a lot!