c26be39719
# Objective - Since #4224, using labels which only refer to one system doesn't make sense. ## Solution - Remove some of those. ## Future work - We should remove the ability to use strings as system labels entirely. I haven't in this PR because there are tests which use this, and that's a lot of code to change. - The only use cases for labels are either intra-crate, which use #4224, or inter-crate, which should either use #4224 or explicit types. Neither of those should use strings.
45 lines
1.2 KiB
Rust
45 lines
1.2 KiB
Rust
use bevy_ecs::prelude::*;
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use rand::Rng;
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use std::ops::Deref;
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// In this example we add a counter resource and increase it's value in one system,
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// while a different system prints the current count to the console.
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fn main() {
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// Create a world
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let mut world = World::new();
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// Add the counter resource
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world.insert_resource(Counter { value: 0 });
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// Create a schedule and a stage
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let mut schedule = Schedule::default();
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let mut update = SystemStage::parallel();
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// Add systems to increase the counter and to print out the current value
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update.add_system(increase_counter);
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update.add_system(print_counter.after(increase_counter));
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schedule.add_stage("update", update);
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for iteration in 1..=10 {
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println!("Simulating frame {}/10", iteration);
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schedule.run(&mut world);
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}
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}
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// Counter resource to be increased and read by systems
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#[derive(Debug)]
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struct Counter {
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pub value: i32,
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}
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fn increase_counter(mut counter: ResMut<Counter>) {
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if rand::thread_rng().gen_bool(0.5) {
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counter.value += 1;
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println!(" Increased counter value");
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}
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}
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fn print_counter(counter: Res<Counter>) {
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println!(" {:?}", counter.deref());
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}
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