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#![warn(missing_docs)]
#![warn(unused_results)]
#[macro_export]
macro_rules! hashmap {
(@single $($x:tt)*) => (());
(@count $($rest:expr),*) => (<[()]>::len(&[$(hashmap!(@single $rest)),*]));
($($key:expr => $value:expr,)+) => { hashmap!($($key => $value),+) };
($($key:expr => $value:expr),*) => {
{
let _cap = hashmap!(@count $($key),*);
#[allow(clippy::let_and_return)]
let mut _map = $crate::HashMap::with_capacity(_cap);
$(
let _ = _map.insert($key, $value);
)*
_map
}
};
}
#[doc(hidden)]
pub fn __id<T>(t: T) -> T {
t
}
#[test]
fn test_hashmap() {
use crate::HashMap;
let names = hashmap! {
1 => "one",
2 => "two",
};
assert_eq!(names.len(), 2);
assert_eq!(names[&1], "one");
assert_eq!(names[&2], "two");
assert_eq!(names.get(&3), None);
let empty: HashMap<i32, i32> = hashmap! {};
assert_eq!(empty.len(), 0);
let _nested_compiles = hashmap! {
1 => hashmap!{0 => 1 + 2,},
2 => hashmap!{1 => 1,},
};
}