macro_rules! indexmap { (@single $($x:tt)*) => { ... }; (@count $($rest:expr),*) => { ... }; ($($key:expr => $value:expr,)+) => { ... }; ($($key:expr => $value:expr),*) => { ... }; }
Expand description
Create an IndexMap
from a list of key-value pairs
Example
use indexmap::indexmap;
let map = indexmap!{
"a" => 1,
"b" => 2,
};
assert_eq!(map["a"], 1);
assert_eq!(map["b"], 2);
assert_eq!(map.get("c"), None);
// "a" is the first key
assert_eq!(map.keys().next(), Some(&"a"));