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3 changed files with 50 additions and 0 deletions
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@ -391,6 +391,10 @@ path = "examples/ecs/state.rs"
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name = "system_chaining"
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path = "examples/ecs/system_chaining.rs"
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[[example]]
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name = "system_closure"
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path = "examples/ecs/system_closure.rs"
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[[example]]
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name = "system_param"
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path = "examples/ecs/system_param.rs"
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@ -190,6 +190,7 @@ Example | File | Description
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`startup_system` | [`ecs/startup_system.rs`](./ecs/startup_system.rs) | Demonstrates a startup system (one that runs once when the app starts up)
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`state` | [`ecs/state.rs`](./ecs/state.rs) | Illustrates how to use States to control transitioning from a Menu state to an InGame state
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`system_chaining` | [`ecs/system_chaining.rs`](./ecs/system_chaining.rs) | Chain two systems together, specifying a return type in a system (such as `Result`)
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`system_closure` | [`ecs/system_closure.rs`](./ecs/system_closure.rs) | Show how to use closures as systems, and how to configure `Local` variables by capturing external state
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`system_param` | [`ecs/system_param.rs`](./ecs/system_param.rs) | Illustrates creating custom system parameters with `SystemParam`
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`system_sets` | [`ecs/system_sets.rs`](./ecs/system_sets.rs) | Shows `SystemSet` use along with run criterion
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`timers` | [`ecs/timers.rs`](./ecs/timers.rs) | Illustrates ticking `Timer` resources inside systems and handling their state
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45
examples/ecs/system_closure.rs
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45
examples/ecs/system_closure.rs
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@ -0,0 +1,45 @@
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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!("{} - updated", value);
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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_plugin(LogPlugin)
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// we can use a closure as a system
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.add_system(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_system(complex_closure("foo".into()))
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// we can also inline a closure
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.add_system(|| {
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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_system(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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