Implement optional iterator features

kpreid / exhaust

Exhaustive iteration trait in Rust

https://docs.rs/exhaust/

Apache License 2.0

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Implement optional iterator features #5

Open kpreid opened 2 years ago

kpreid commented 2 years ago

[ ] FusedIterator
[ ] ExactSizeIterator, at least for fieldless enums.
[ ] Iterator::size_hint()
[ ] DoubleEndedIterator — or not, because that has costs to implement.
[ ] Iterator::fold() and Iterator::try_fold() overrides.

Each of these should have tests, and documentation for the conditions under which it exists.

kpreid commented 2 weeks ago

These should also be opt-in (controlled by derive helper attributes or separate derive macros) to ensure that dependents don't accidentally break semver by changing the types of private fields whose properties were exposed.