Struct SystemTable 

pub struct SystemTable {
    pub entries: &'static [SystemEntry],
    pub before_init: Option<fn(&mut PipelineContext<'_>)>,
    pub prepare_events: Option<fn(&mut EventStore, Access)>,
}

A host’s system table and the load-time passes only the host can supply.

The entries name the host’s own system types, so the table is written where those types live; everything that runs it is here.

Fields

entries: &'static [SystemEntry]

One entry per system, in run order.

before_init: Option<fn(&mut PipelineContext<'_>)>

Runs over the world once its systems are built and before their init. Absent leaves the loaded content exactly as it was added.

prepare_events: Option<fn(&mut EventStore, Access)>

Pre-creates the event queues a scheduled system’s declared access can touch, so its events_mut never grows the store’s map mid-tick. Absent leaves every queue to be created on first use.

Implementations

impl SystemTable

pub const EMPTY: Self

A table with no systems and no load-time passes: what a world runs when its host contributes none.