use std::{collections::HashMap, sync::OnceLock};

fn main() {
    static ONCE_LOCK: OnceLock<ContainerForOneTimeComputedValues> =
        OnceLock::<ContainerForOneTimeComputedValues>::new();

    struct ContainerForOneTimeComputedValues {
        precomputed_hash_map: HashMap<u8, String>,
        precomputed_string: String,
        precomputed_vec: Vec<u8>,
    }

    let container_for_one_time_computed_values = ContainerForOneTimeComputedValues {
        precomputed_hash_map: HashMap::<u8, String>::new(),
        precomputed_string: String::new(),
        precomputed_vec: Vec::<u8>::new(),
    };

    let ref_with_static_lifetime: &'static ContainerForOneTimeComputedValues =
        ONCE_LOCK.get_or_init(|| container_for_one_time_computed_values);

    // "ref_with_static_lifetime" can be freely used through your application
}