ex.rs

use std::collections::HashMap;
use std::sync::Mutex;

use lazy_static::lazy_static;

type GlobalMap = Mutex<HashMap<&'static str, &'static str>>;

lazy_static! {
    static ref GLOBAL_DATA2: GlobalMap = Mutex::new(HashMap::new());
}

struct GlobalData2;

impl GlobalData2 {
    pub fn set(key: &'static str, value: &'static str) {
        let mut map = GLOBAL_DATA2.lock().unwrap();
        map.insert(key, value);
    }

    pub fn get(key: &str) -> &'static str {
        let map = GLOBAL_DATA2.lock().unwrap();

        map.get(key)
            .expect("Unable to fetch key?")
    }
}

fn main() {
    GlobalData2::set("Hello", "World");
    let s = GlobalData2::get("Hello");
    println!("{s}");
}