Trait enum_map::Internal
[−]
[src]
pub trait Internal<V>: Sized { type Array; }
Internal enum mapping type
This trait is internally used by #[derive(EnumMap)]
. Despite it being
a public trait, it's not intended to be public. Internal<T>
is
implemented by any enum type where V is a generic type representing a
value. The purpose of this generic type is to allow providing a value
type for arrays, as Rust currently does not support higher kinded types.
Users aren't expected to use this trait directly, but rather to use
EnumMap<K, V>
which uses this internally.
This trait is also implemented by bool
and u8
type. While u8
is
strictly speaking not an actual enum, there are good reasons to consider
it like one, as array of u8
keys is a relatively common pattern.
Associated Types
type Array
Representation of an enum map for type V
, usually an array.