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Added a generic systems example to the examples folder in bevy. #2191

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Added a generic systems example to the examples folder in bevy. #2191

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9b8c2b3
Added a generic systems example to the examples folder in bevy.
AmrDhaliwal May 17, 2021
0921bb4
Added generic systems as an example to Cargo.toml and examples/README…
AmrDhaliwal May 18, 2021
76ce2be
Added mouse inputs to the generic_systems example.
AmrDhaliwal May 19, 2021
0c78aac
Changed inputs from being negated to accepted.
AmrDhaliwal May 19, 2021
4738f76
Restructured for loop to have results of just pressed outside the loop.
AmrDhaliwal May 20, 2021
993cb23
Updated the generic system example to be able to us const generics.
AmrDhaliwal May 27, 2021
911b603
Moved the fn main() to the top of the file and constrained T on default.
AmrDhaliwal May 28, 2021
967440f
Added the second type parameter to the fn main() function.
AmrDhaliwal Jun 2, 2021
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4 changes: 4 additions & 0 deletions Cargo.toml
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Expand Up @@ -303,6 +303,10 @@ path = "examples/ecs/timers.rs"
name = "query_bundle"
path = "examples/ecs/query_bundle.rs"

[[example]]
name = "generic_systems"
path = "examples/ecs/generic_systems.rs"

# Games
[[example]]
name = "alien_cake_addict"
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28 changes: 28 additions & 0 deletions examples/ecs/generic_systems.rs
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@@ -0,0 +1,28 @@
use bevy::{prelude::*, ecs::component::Component};

fn main() {
App::build()
.add_plugins(DefaultPlugins)
.add_system(spawn_entities_on_click::<A>.system())
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I think this needs the second type parameter to work :)

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@alice-i-cecile do you mean the second parameter type for the function?

.add_system(spawn_entities_on_click::<B>.system())
.run();
}

struct A;
struct B;

fn spawn_entities_on_click<T: Component, const N: usize>(
mut cmds: Commands,
mouse_button_inputs: Res<Input<MouseButton>>,
)
where
T: Component + Default
{
if mouse_button_inputs.just_pressed(MouseButton::Left) {
for _ in 0..N {
cmds.spawn().insert(T::default()).id();
}
info!("spawned {} entities with component {}", N, std::any::type_name::<T>());
}
}