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https://github.com/bevyengine/bevy
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# Objective This is a necessary precursor to #9122 (this was split from that PR to reduce the amount of code to review all at once). Moving `!Send` resource ownership to `App` will make it unambiguously `!Send`. `SubApp` must be `Send`, so it can't wrap `App`. ## Solution Refactor `App` and `SubApp` to not have a recursive relationship. Since `SubApp` no longer wraps `App`, once `!Send` resources are moved out of `World` and into `App`, `SubApp` will become unambiguously `Send`. There could be less code duplication between `App` and `SubApp`, but that would break `App` method chaining. ## Changelog - `SubApp` no longer wraps `App`. - `App` fields are no longer publicly accessible. - `App` can no longer be converted into a `SubApp`. - Various methods now return references to a `SubApp` instead of an `App`. ## Migration Guide - To construct a sub-app, use `SubApp::new()`. `App` can no longer convert into `SubApp`. - If you implemented a trait for `App`, you may want to implement it for `SubApp` as well. - If you're accessing `app.world` directly, you now have to use `app.world()` and `app.world_mut()`. - `App::sub_app` now returns `&SubApp`. - `App::sub_app_mut` now returns `&mut SubApp`. - `App::get_sub_app` now returns `Option<&SubApp>.` - `App::get_sub_app_mut` now returns `Option<&mut SubApp>.`
31 lines
752 B
Rust
31 lines
752 B
Rust
//! This example demonstrates you can create a custom runner (to update an app manually). It reads
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//! lines from stdin and prints them from within the ecs.
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use bevy::prelude::*;
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use std::io;
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#[derive(Resource)]
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struct Input(String);
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fn my_runner(mut app: App) {
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println!("Type stuff into the console");
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for line in io::stdin().lines() {
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{
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let mut input = app.world_mut().resource_mut::<Input>();
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input.0 = line.unwrap();
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}
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app.update();
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}
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}
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fn print_system(input: Res<Input>) {
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println!("You typed: {}", input.0);
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}
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fn main() {
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App::new()
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.insert_resource(Input(String::new()))
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.set_runner(my_runner)
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.add_systems(Update, print_system)
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.run();
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}
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