fn hashmap_drain_filter_in_place<K, V, F>(hash_map: &mut HashMap<K, V>, pred: F) -> Vec<K>
where
    K: Eq + Hash + Copy,
    F: Fn(&V) -> bool,
{
    let (drained, retained): (Vec<_>, HashMap<_, _>) =
        hash_map.drain().partition_map(|(k, v)| match pred(&v) {
            true => Either::Left(k),
            false => Either::Right((k, v)),
        });
    hash_map.extend(retained);
    drained
}
/// Drains items that satisfy the given predicate from the hash map and retains the rest.
/// Returns keys of the drained elements.
///
/// To be replaced with `HashMap::drain_filter` when stabilized.
/// [https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.drain_filter]
Drains items that satisfy the given predicate from the hash map and retains the rest.
Returns keys of the drained elements.

To be replaced with `HashMap::drain_filter` when stabilized.
Drains items that satisfy the given predicate from the hash map and retains the rest . Returns keys of the drained elements . To be replaced with ` HashMap :: drain_filter ` when stabilized .
fn hashmap_drain_filter_in_place<K, V, F>(hash_map: &mut HashMap<K, V>, pred: F) -> Vec<K>
where
    K: Eq + Hash + Copy,
    F: Fn(&V) -> bool,
{
    let (drained, retained): (Vec<_>, HashMap<_, _>) =
        hash_map.drain().partition_map(|(k, v)| match pred(&v) {
            true => Either::Left(k),
            false => Either::Right((k, v)),
        });
    hash_map.extend(retained);
    drained
}
fn hashmap_drain_filter_in_place < K , V , F > ( hash_map : & mut HashMap < K , V > , pred : F ) -> Vec < K > where K : Eq + Hash + Copy , F : Fn ( & V ) -> bool , { let ( drained , retained ) : ( Vec < _ > , HashMap < _ , _ > ) = hash_map . drain ( ) . partition_map ( | ( k , v ) | match pred ( & v ) { true => Either :: Left ( k ) , false => Either :: Right ( ( k , v ) ) , } ) ; hash_map . extend ( retained ) ; drained }
Drains items that satisfy the given predicate from the hash map and retains the rest.
Drains items that satisfy the given predicate from the hash map and retains the rest .
hash_map
&mut HashMap<K, V>
pred
F
hash_map
&mut HashMap<K, V>
pred
F