CODEWITHSUNDEEP
rust
iamsaquib8
iamsaquib8

Reputation: 414

How to use const inside modules?

I have the following code:

mod delicious_snacks {
    use self::fruits::PEAR as fruit;
    use self::veggies::CUCUMBER as veggie;

    mod fruits {
        pub const PEAR: &'static str = "Pear";
        pub const APPLE: &'static str = "Apple";
    }

    mod veggies {
        pub const CUCUMBER: &'static str = "Cucumber";
        pub const CARROT: &'static str = "Carrot";
    }
}

fn main() {
    println!(
        "favorite snacks: {} and {}",
            delicious_snacks::fruit,
            delicious_snacks::veggie
    );
}

I'm getting an error that fruit and veggie are private when I try to print them:

error[E0603]: constant `fruit` is private
  --> src/main.rs:19:31
   |
19 |             delicious_snacks::fruit,
   |                               ^^^^^

error[E0603]: constant `veggie` is private
  --> src/main.rs:20:31
   |
20 |             delicious_snacks::veggie
   |                               ^^^^^^

Can any one explain me this and help me resolve?

Upvotes: 7

Views: 3958

Answers (3)

buste ana
buste ana

Reputation: 1

To use

pub mod fruits {

and

println!(
        "favorite snacks: {}",
        delicious_snacks::fruits::PEAR,
);

is another way to address problem

Upvotes: -1

mcarton
mcarton

Reputation: 30061

The accessibility of an item defined with use is independent from the accessibility of the used item. This means that while PEAR is public, use self::fruits::PEAR as fruit; is private. You must export those items publicly:

pub use self::fruits::PEAR as fruit;
pub use self::veggies::CUCUMBER as veggie;

(Permalink to the playground)

Upvotes: 15

SirDarius
SirDarius

Reputation: 42959

It means it is only visible from the delicious_snacks module.

To use delicious_snacks::fruit and the other constants, they need to be exported publicly from the module using the pub modifier:

mod delicious_snacks {
    pub use self::fruits::PEAR as fruit;
    pub use self::veggies::CUCUMBER as veggie;

Upvotes: 1

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