Jeremy Fitzhardinge af66aed83e subscriber: Implement layer::Filter for Option<Filter> (#2407)
It's currently awkward to have an optional per-layer filter.

Implement `Filter<L>` for `Option<F> where F: Filter<L>`, following the example
of `Layer`. A `None` filter passes everything through.

Also, it looks like Filter for Arc/Box doesn't pass through all the methods, so
extend the `filter_impl_body` macro to include them.

This also adds a couple of tests and updates the docs.

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Co-authored-by: David Barsky <me@davidbarsky.com>
Co-authored-by: Ryan Johnson <ryantj@fb.com>
Co-authored-by: Eliza Weisman <eliza@buoyant.io>
2023-10-01 10:46:02 -07:00
..