bevy/crates/bevy_ecs/src/schedule
Christian Hughes b4071ca370
Add World::get_resource_or_init as an alternative to World::get_resource_or_insert_with (#15758)
# Objective

If a `Resource` implements `FromWorld` or `Default`, it's nicer to be
able to write:

```rust
let foo = world.get_resource_or_init::<Foo>();
```

Rather than:

```rust
let foo = world.get_resource_or_insert_with(Foo::default);
```

The latter is also not possible if a type implements `FromWorld` only,
and not `Default`.

## Solution

Added:

```rust
impl World {
    pub fn get_resource_or_init<R: Resource + FromWorld>(&mut self) -> Mut<'_, R>;
}
```

Turns out all current in-engine uses of `get_resource_or_insert_with`
are exactly the above, so they've also been replaced.

## Testing

- Added a doc-test.
- Also added a doc-test for `World::get_resource_or_insert_with`.
2024-10-09 20:56:26 +00:00
..
executor Better warnings about invalid parameters (#15500) 2024-10-03 13:16:55 +00:00
condition.rs Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
config.rs Group IntoSystemConfigs impls together (#15254) 2024-09-17 17:57:22 +00:00
graph_utils.rs Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
mod.rs Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
schedule.rs Add World::get_resource_or_init as an alternative to World::get_resource_or_insert_with (#15758) 2024-10-09 20:56:26 +00:00
set.rs Add core and alloc over std Lints (#15281) 2024-09-27 00:59:59 +00:00
stepping.rs Remove thiserror from bevy_ecs (#15774) 2024-10-09 14:20:58 +00:00