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bevy_ecs: Fix up docs for World::run_system and World::run_system_with_input (#12289)

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# Objective

- The doc example for `World::run_system_with_input` mistakenly
indicates that systems share state
- Some of the doc example code is unnecessary and/or could be cleaned up

## Solution

Replace the incorrect result value for the correct one in the doc
example. I also went with an explicit `assert_eq` check as it presents
the same information but can be validated by CI via doc tests.

Also removed some unnecessary code, such as the `Resource` derives on
`Counter`. In fact, I just replaced `Counter` with a `u8` in the
`Local`. I think it makes the example a little cleaner.

---

## Changelog

- Update docs for `World::run_system` and `World::run_system_with_input`
This commit is contained in:
Gino Valente 2024-03-04 14:59:24 -07:00 committed by GitHub
parent e32791e97a
commit e8583d132c
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1 changed files with 9 additions and 15 deletions
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24
crates/bevy_ecs/src/system/system_registry.rs
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@ -164,12 +164,9 @@ impl World {
///
/// ```
/// # use bevy_ecs::prelude::*;
/// #[derive(Resource, Default)]
/// struct Counter(u8);
///
/// fn increment(mut counter: Local<Counter>) {
/// counter.0 += 1;
/// println!("{}", counter.0);
/// fn increment(mut counter: Local<u8>) {
/// *counter += 1;
/// println!("{}", *counter);
/// }
///
/// let mut world = World::default();
@ -255,20 +252,17 @@ impl World {
///
/// ```
/// # use bevy_ecs::prelude::*;
/// #[derive(Resource, Default)]
/// struct Counter(u8);
///
/// fn increment(In(increment_by): In<u8>, mut counter: Local<Counter>) {
/// counter.0 += increment_by;
/// println!("{}", counter.0);
/// fn increment(In(increment_by): In<u8>, mut counter: Local<u8>) -> u8 {
/// *counter += increment_by;
/// *counter
/// }
///
/// let mut world = World::default();
/// let counter_one = world.register_system(increment);
/// let counter_two = world.register_system(increment);
/// world.run_system_with_input(counter_one, 1); // -> 1
/// world.run_system_with_input(counter_one, 20); // -> 21
/// world.run_system_with_input(counter_two, 30); // -> 51
/// assert_eq!(world.run_system_with_input(counter_one, 1).unwrap(), 1);
/// assert_eq!(world.run_system_with_input(counter_one, 20).unwrap(), 21);
/// assert_eq!(world.run_system_with_input(counter_two, 30).unwrap(), 30);
/// ```
///
/// See [`World::run_system`] for more examples.