mirror of
https://github.com/bevyengine/bevy
synced 2024-12-26 13:03:06 +00:00
f18f28874a
# Objective - Better consistency with `add_systems`. - Deprecating `add_plugin` in favor of a more powerful `add_plugins`. - Allow passing `Plugin` to `add_plugins`. - Allow passing tuples to `add_plugins`. ## Solution - `App::add_plugins` now takes an `impl Plugins` parameter. - `App::add_plugin` is deprecated. - `Plugins` is a new sealed trait that is only implemented for `Plugin`, `PluginGroup` and tuples over `Plugins`. - All examples, benchmarks and tests are changed to use `add_plugins`, using tuples where appropriate. --- ## Changelog ### Changed - `App::add_plugins` now accepts all types that implement `Plugins`, which is implemented for: - Types that implement `Plugin`. - Types that implement `PluginGroup`. - Tuples (up to 16 elements) over types that implement `Plugins`. - Deprecated `App::add_plugin` in favor of `App::add_plugins`. ## Migration Guide - Replace `app.add_plugin(plugin)` calls with `app.add_plugins(plugin)`. --------- Co-authored-by: Carter Anderson <mcanders1@gmail.com>
47 lines
1.6 KiB
Rust
47 lines
1.6 KiB
Rust
//! Shows how anonymous functions / closures can be used as systems.
|
|
|
|
use bevy::{log::LogPlugin, prelude::*};
|
|
|
|
fn main() {
|
|
// create a simple closure.
|
|
let simple_closure = || {
|
|
// this is a closure that does nothing.
|
|
info!("Hello from a simple closure!");
|
|
};
|
|
|
|
// create a closure, with an 'input' value.
|
|
let complex_closure = |mut value: String| {
|
|
move || {
|
|
info!("Hello from a complex closure! {:?}", value);
|
|
|
|
// we can modify the value inside the closure. this will be saved between calls.
|
|
value = format!("{value} - updated");
|
|
|
|
// you could also use an outside variable like presented in the inlined closures
|
|
// info!("outside_variable! {:?}", outside_variable);
|
|
}
|
|
};
|
|
|
|
let outside_variable = "bar".to_string();
|
|
|
|
App::new()
|
|
.add_plugins(LogPlugin::default())
|
|
// we can use a closure as a system
|
|
.add_systems(Update, simple_closure)
|
|
// or we can use a more complex closure, and pass an argument to initialize a Local variable.
|
|
.add_systems(Update, complex_closure("foo".into()))
|
|
// we can also inline a closure
|
|
.add_systems(Update, || {
|
|
info!("Hello from an inlined closure!");
|
|
})
|
|
// or use variables outside a closure
|
|
.add_systems(Update, move || {
|
|
info!(
|
|
"Hello from an inlined closure that captured the 'outside_variable'! {:?}",
|
|
outside_variable
|
|
);
|
|
// you can use outside_variable, or any other variables inside this closure.
|
|
// their states will be saved.
|
|
})
|
|
.run();
|
|
}
|