Trait codegen::OptionalComponent [−][src]
pub trait OptionalComponent<T>: Sized { }Expand description
A marker trait for standard archetypes.
If A: OptionalComponent<B>,
this means that all entities with B
should also have A.
This dependency is not enforced anywhere.
It merely serves for documentation purpose.
This is used to annotate the standard component set of an entity,
using the identification type as B.
e.g. all optional components for nodes implement OptionalComponent<node::Id>.