1ba7429371
# Objective Provide a starting point for #3951, or a partial solution. Providing a few comment blocks to discuss, and hopefully find better one in the process. ## Solution Since I am pretty new to pretty much anything in this context, I figured I'd just start with a draft for some file level doc blocks. For some of them I found more relevant details (or at least things I considered interessting), for some others there is less. ## Changelog - Moved some existing comments from main() functions in the 2d examples to the file header level - Wrote some more comment blocks for most other 2d examples TODO: - [x] 2d/sprite_sheet, wasnt able to come up with something good yet - [x] all other example groups... Also: Please let me know if the commit style is okay, or to verbose. I could certainly squash these things, or add more details if needed. I also hope its okay to raise this PR this early, with just a few files changed. Took me long enough and I dont wanted to let it go to waste because I lost motivation to do the whole thing. Additionally I am somewhat uncertain over the style and contents of the commets. So let me know what you thing please.
48 lines
1.6 KiB
Rust
48 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!("{} - 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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