Trait Indexed

pub trait Indexed {
    const SIZE: usize;

    // Required methods
    fn index(&self) -> usize;
    fn from_index(index: usize) -> Option<Self>
       where Self: Sized;
}

An indexed set of finitely many possibilities.

Can be implemented automatically for enum types with no internal data using #[derive(Indexed)].

use relearn::spaces::Indexed;

#[derive(Indexed)]
enum Foo {
    A,
    B,
}

assert_eq!(Foo::SIZE, 2);
assert_eq!(Foo::B.index(), 1);

Required Associated Constants

const SIZE: usize

The number of possible values this type can represent.

Required Methods

fn index(&self) -> usize

The index of this element.

fn from_index(index: usize) -> Option<Self>

where Self: Sized,

Construct from an index.

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.

Implementations on Foreign Types

impl Indexed for bool

const SIZE: usize = 2usize

fn index(&self) -> usize

fn from_index(index: usize) -> Option<Self>

Implementors

impl Indexed for CellView

const SIZE: usize = 4usize

impl Indexed for Move

const SIZE: usize = 5usize