Struct Schedule 

pub struct Schedule { /* private fields */ }

Stage-based system scheduler.

Systems are grouped into stages. Stages run in the order they were first registered. Within a stage, systems run in registration order.

Systems are parameterized functions that declare their data access via SystemParam.

Implementations

impl Schedule

pub fn new() -> Self

pub fn add_system<P>( &mut self, stage: &'static str, name: &'static str, func: impl IntoSystem<P>, ) -> &mut Self

Add a system to a named stage.

Accepts any function that implements IntoSystem — parameterized functions like fn(Res<T>, QueryMut<U>).

pub fn run(&mut self, world: &mut World)

Run all systems in stage order.

Execution order each tick:

1. Drain deadlines — fires all overdue deadlines into Events current.
2. Advance event buffers — current → previous (fired deadlines become readable), old previous cleared.
3. Run systems by stage — EventReader sees fired deadlines + any events from the previous tick. Commands applied between stages.

pub fn system_count(&self) -> usize

Returns the number of registered systems.

pub fn stages(&self) -> &[&'static str]

Returns the stage names in execution order.

Trait Implementations

impl Default for Schedule

fn default() -> Self

Returns the “default value” for a type.