HashMap::clear

pub fn clear()

use collections::map::{HashMap};

Removes every entry, keeping the bucket count.

Called on a HashMap value as value.clear(…).

Contracts#

Checked according to --contracts (see Contracts).

ensures self.len == 0

Examples#

use collections::map::{HashMap};
use tests::assert;
let m: HashMap<int, int> = HashMap::new();
m.insert(1, 10);
m.clear();
assert!(m.is_empty());
assert!(!m.contains(1));

See also#

• HashMap: A hash map from keys of type K to values of type V.
• HashMap::with_capacity: Creates an empty map with room for about cap buckets before it grows.
• HashMap::new: Creates an empty map.
• HashMap::size: Returns the number of entries.
• HashMap::is_empty: Returns true when the map has no entries.
• HashMap::capacity: Returns the number of buckets.
• HashMap::keys: Returns the keys, in insertion order.
• HashMap::values: Returns the values, in the insertion order of their keys.