Trait EntityOrientedMapKey

pub trait EntityOrientedMapKey<V>: Copy {
    type Entity: Entity;
    type DenseValueSlots: Default;

    // Required methods
    fn to_entity(key: Self) -> Self::Entity;
    fn get_dense_value_slot(
        key: Self,
        slots: &Self::DenseValueSlots,
    ) -> &Option<V>;
    fn get_dense_value_slot_mut(
        key: Self,
        slots: &mut Self::DenseValueSlots,
    ) -> &mut Option<V>;
}

EntityOriented*Map<Self, V> support trait, implemented for entity types, but which can also be implemented by users for their own newtypes and other types wrapping entity types (such as finite enums).

Required Associated Types

type Entity: Entity

The entity type that appears exactly once in every value of Self.

type DenseValueSlots: Default

A type holding enough different Option<V> slots, for all possible values of Self, for a given Self::Entity value contained inside.

Required Methods

fn to_entity(key: Self) -> Self::Entity

fn get_dense_value_slot(key: Self, slots: &Self::DenseValueSlots) -> &Option<V>

fn get_dense_value_slot_mut( key: Self, slots: &mut Self::DenseValueSlots, ) -> &mut Option<V>

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<E: Entity, V> EntityOrientedMapKey<V> for E

type Entity = E

type DenseValueSlots = Option<V>