Struct SystemEntry 

pub struct SystemEntry {
    pub name: &'static str,
    pub present_when: &'static str,
    pub gate: fn(&World) -> Option<Box<dyn System>>,
    pub after: &'static [&'static str],
    pub before: &'static [&'static str],
}

One row of the system table. Table order is run order.

Fields

name: &'static str

The entry name; the system’s stable display name.

present_when: &'static str

Human-readable gate condition, for docs and CLI reporting.

gate: fn(&World) -> Option<Box<dyn System>>

Constructs the system from world content when its gate holds. Runs from World::start and from World::system_manifest, which discards the value, so a system’s constructor must stay cheap and side-effect-free.

after: &'static [&'static str]

Systems (by entry name) that must run earlier in the tick than this one. Validated against table order at schedule build: the table stays the one execution order, and an edge that contradicts it is a startup panic, not a silent reorder.

before: &'static [&'static str]

Systems this one must run before.