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https://github.com/bevyengine/bevy
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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.
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use bevy::{log::LogPlugin, prelude::*};
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fn main() {
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// create a simple closure.
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let simple_closure = || {
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// this is a closure that does nothing.
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info!("Hello from a simple closure!");
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};
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// create a closure, with an 'input' value.
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let complex_closure = |mut value: String| {
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move || {
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info!("Hello from a complex closure! {:?}", value);
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// we can modify the value inside the closure. this will be saved between calls.
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value = format!("{value} - updated");
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// you could also use an outside variable like presented in the inlined closures
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// info!("outside_variable! {:?}", outside_variable);
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}
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};
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let outside_variable = "bar".to_string();
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App::new()
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.add_plugins(LogPlugin::default())
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// we can use a closure as a system
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.add_systems(Update, simple_closure)
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// or we can use a more complex closure, and pass an argument to initialize a Local variable.
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.add_systems(Update, complex_closure("foo".into()))
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// we can also inline a closure
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.add_systems(Update, || {
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info!("Hello from an inlined closure!");
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})
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// or use variables outside a closure
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.add_systems(Update, move || {
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info!(
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"Hello from an inlined closure that captured the 'outside_variable'! {:?}",
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outside_variable
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);
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// you can use outside_variable, or any other variables inside this closure.
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// their states will be saved.
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})
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.run();
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}
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