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Remind users to initialize their systems before running them (#3947)

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# Objective

- Manually running systems is a somewhat obscure process: systems must be initialized before they are run
- The unwrap is rather hard to debug.

## Solution

- Replace unwraps in `FunctionSystem` methods with expects (progress towards #3892).
- Briefly document this requirement.
This commit is contained in:
Alice Cecile 2022-05-02 16:04:49 +00:00
parent 61a3494a06
commit 8283db69b4
1 changed files with 4 additions and 2 deletions
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6
crates/bevy_ecs/src/system/function_system.rs
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@ -305,6 +305,8 @@ pub struct InputMarker;
/// You get this by calling [`IntoSystem::into_system`] on a function that only accepts
/// [`SystemParam`]s. The output of the system becomes the functions return type, while the input
/// becomes the functions [`In`] tagged parameter or `()` if no such parameter exists.
///
/// [`FunctionSystem`] must be `.initialized` before they can be run.
pub struct FunctionSystem<In, Out, Param, Marker, F>
where
Param: SystemParam,
@ -378,7 +380,7 @@ where
let change_tick = world.increment_change_tick();
let out = self.func.run(
input,
self.param_state.as_mut().unwrap(),
self.param_state.as_mut().expect("System's param_state was not found. Did you forget to initialize this system before running it?"),
&self.system_meta,
world,
change_tick,
@ -389,7 +391,7 @@ where
#[inline]
fn apply_buffers(&mut self, world: &mut World) {
let param_state = self.param_state.as_mut().unwrap();
let param_state = self.param_state.as_mut().expect("System's param_state was not found. Did you forget to initialize this system before running it?");
param_state.apply(world);
}