Trait Indexed 

pub trait Indexed {
    const VARIANTS_LEN: usize;
    const VARIANTS_NAMES: &'static [&'static str];
}

Allows getting an index from an enum’s variant to a usize, and also get the same variant from said index, for example, having the following implementation:

#[repr(usize)]
enum Number{ First, Second, Third }

impl indexed_valued_enums::indexed_enum::Indexed for Number{
    const VARIANTS_LEN: usize = 3;
    const VARIANTS_NAMES: &'static [&'static str] = &["First", "Second", "Third"];
}

impl indexed_valued_enums::indexed_enum::IndexedWithVariant for Number{
    const VARIANTS: &'static [Self] = &[Number::First, Number::Second, Number::Third];
}

Calling variant_index on every enum produces [First->0, Second->1, Third->2].

Calling on from_variant_index over the enums would produce [0->First, 1->Second, 2->Third].

Note this documentation it’s solely informational, it is dis-recommended to implement this trait manually, but using the derive macro [crate::legacy::valued_enum::Valued] or the declarative macro [crate::create_indexed_valued_enum] instead.

Required Associated Constants

const VARIANTS_LEN: usize

Number of variants.

IndexedWithVariant::VARIANTS and Self::VARIANTS_NAMES should have the same length as this constant.

const VARIANTS_NAMES: &'static [&'static str]

Array with the name of every variant

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Indexed for indexed_valued_enums::examples::example_1_basic_enum_and_values::Planet

Available on crate feature docs only.

const VARIANTS_LEN: usize = 8usize

const VARIANTS_NAMES: &'static [&'static str]

impl Indexed for indexed_valued_enums::examples::example_2_csv::Planet

Available on crate feature docs only.

const VARIANTS_LEN: usize = 8usize

const VARIANTS_NAMES: &'static [&'static str]

impl Indexed for PlanetVF

Available on crate feature docs only.

const VARIANTS_LEN: usize = 8usize

const VARIANTS_NAMES: &'static [&'static str]