pub trait System<'a> {
    type SystemData: DynamicSystemData<'a>;

    fn run(&mut self, data: Self::SystemData);

    fn running_time(&self) -> RunningTime { ... }
    fn accessor(&'b self) -> AccessorCow<'a, 'b, Self> { ... }
    fn setup(&mut self, world: &mut World) { ... }
    fn dispose(self, world: &mut World) { ... }
Expand description

A System, executed with a set of required Resources.

Required Associated Types

The resource bundle required to execute this system.

You will mostly use a tuple of system data (which also implements SystemData). You can also create such a resource bundle by simply deriving SystemData for a struct.

Every SystemData is also a DynamicSystemData.

Required Methods

Executes the system with the required system data.

Provided Methods

Returns a hint how long the system needs for running. This is used to optimize the way they’re executed (might allow more parallelization).

Defaults to RunningTime::Average.

Return the accessor from the SystemData.

Sets up the World using Self::SystemData::setup.

Performs clean up that requires resources from the World. This commonly removes components from world which depend on external resources.