Trait KeySet 

pub trait KeySet<K> {
    // Required methods
    fn len(&self) -> usize;
    fn contains(&self, key: &K) -> bool;
    fn for_each(&self, out: &mut dyn FnMut(&K));

    // Provided method
    fn is_empty(&self) -> bool { ... }
}

A set-like collection that can drive SetTrie traversal.

Required Methods

fn len(&self) -> usize

Number of keys in the set.

fn contains(&self, key: &K) -> bool

Return whether the set contains key.

fn for_each(&self, out: &mut dyn FnMut(&K))

Visit every key in the set.

Provided Methods

fn is_empty(&self) -> bool

Return whether the set contains no keys.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<K, S> KeySet<K> for HashSet<K, S>

where K: Eq + Hash, S: BuildHasher,

fn len(&self) -> usize

fn contains(&self, key: &K) -> bool

fn for_each(&self, out: &mut dyn FnMut(&K))

impl<K, T> KeySet<K> for &T

where T: KeySet<K> + ?Sized,

fn len(&self) -> usize

fn contains(&self, key: &K) -> bool

fn for_each(&self, out: &mut dyn FnMut(&K))

Implementors