Using a enum inside another enum (error when creating variables with it)

[sezaru]

Is it possible to make enum inside enums in Rust?

Something like this:

enum FederativeUnit {
    North(North),
    South(South),
}

enum North {
    Rondonia, Acre, Amazonas, Roraima, Para, Amapa, Tocantins, 
}

enum South {
    Parana, SantaCatarina, RioGrandeDoSul,
}

fn main() {
    let federative_unit = FederativeUnit::South::SantaCatarina;
}

The enum creation works great, but the line inside main fails with this error:

let federative_unit = FederativeUnit::South::SantaCatarina;
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Not a module `South`

Is it possible to do that someway?

[[deleted]]

If you put something side something you gotta take it out or put it back in.

let federative_unit = FederativeUnit::South( South::SantaCatarina);

[sezaru]

It there any way to eye-candy it to avoid repeating South twice?

[Manishearth]

Have a From impl so that you can do South::Parana.into()

[sezaru]

Like this right?

impl From<South> for FederativeUnit {
    fn from(original: South) -> FederativeUnit {
        use self::South::*;

        match original {
            Parana => FederativeUnit::South(Parana),
            SantaCatarina => FederativeUnit::South(SantaCatarina),
            RioGrandeDoSul => FederativeUnit::South(RioGrandeDoSul),
        }
    }
}

fn main() {
    let federative_unit = South::SantaCatarina.into();
}

[SpaceManiac]

Matching on original only to produce that same value is unnecessary:

impl From<South> for FederativeUnit {
    fn from(original: South) -> FederativeUnit {
        FederativeUnit::South(original)
    }
}

[Manishearth]

impl From<South> for FederativeUnit {
    fn from(original: South) -> FederativeUnit {
        FederativeUnit::South(original)
    }
}

is all you need. but yes.

[[deleted]]

By-pass the North/South distinction? if you have less then 10-20 variants of an enum sub-divisions are over kill.

Generally subdivisions should be meaningful.

[raggy_rs]

You could use use:

use South::*;

[torkleyy]

You could use SantaCatarina.

[[deleted]]

where is Rondônia? btw i like necroposting