Struct BundleComponent 

pub(crate) struct BundleComponent {
    pub(crate) type_id: TypeId,
    pub(crate) name: &'static str,
    pub(crate) column: fn() -> Box<dyn AnyColumn>,
    pub(crate) value: Box<dyn Any>,
}

One component of a bundle: its type, the name and column constructor the world registers it under, and the value box the archetype takes.

The type-keyed facts sit in one entry rather than in parallel arrays, so a component’s type is written once and the arrays cannot fall out of step when they are sorted.

Fields

type_id: TypeId

name: &'static str

column: fn() -> Box<dyn AnyColumn>

value: Box<dyn Any>