Constants
Declare lazily evaluated constant
Declares a lazily evaluated constant HashMap
. The HashMap
will
be evaluated once and stored behind a global static reference.
use lazy_static::lazy_static;
use std::collections::HashMap;
lazy_static! {
static ref PRIVILEGES: HashMap<&'static str, Vec<&'static str>> = {
let mut map = HashMap::new();
map.insert("James", vec!["user", "admin"]);
map.insert("Jim", vec!["user"]);
map
};
}
fn show_access(name: &str) {
let access = PRIVILEGES.get(name);
println!("{}: {:?}", name, access);
}
fn main() {
let access = PRIVILEGES.get("James");
println!("James: {:?}", access);
show_access("Jim");
}