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Giacomo Stevanato 7de271f992
Add FilteredAccess::empty and simplify the implementatin of update_component_access for AnyOf/Or (#14352) 
# Objective

- The implementation of `update_component_access` for `AnyOf`/`Or` is
kinda weird due to special casing the first filter, let's simplify it;
- Fundamentally we want to fold/reduce the various filters using an OR
operation, however in order to do a proper fold we need a neutral
element for the initial accumulator, which for OR is FALSE. However we
didn't have a way to create a `FilteredAccess` value corresponding to
FALSE and thus the only option was reducing, which special cases the
first element as being the initial accumulator.

This is an alternative to https://github.com/bevyengine/bevy/pull/14026

## Solution

- Introduce `FilteredAccess::empty` as a way to create a
`FilteredAccess` corresponding to the logical proposition FALSE;
- Use it as the initial accumulator for the above operations, allowing
to handle all the elements to fold in the same way.

---

## Migration Guide

- The behaviour of `AnyOf<()>` and `Or<()>` has been changed to match no
archetypes rather than all archetypes to naturally match the
corresponding logical operation. Consider replacing them with `()`
instead.
2024-07-29 23:20:06 +00:00
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bevy_ecs Add FilteredAccess::empty and simplify the implementatin of update_component_access for AnyOf/Or (#14352) 2024-07-29 23:20:06 +00:00
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