Trait Len 

pub trait Len {
    // Required method
    fn len(&self) -> usize;

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

Sized collection.

Required Methods

fn len(&self) -> usize

Returns the number of elements in the collection.

Provided Methods

fn is_empty(&self) -> bool

Checks if the collection is empty.

Implementations on Foreign Types

impl<K, V> Len for BTreeMap<K, V>

fn len(&self) -> usize

fn is_empty(&self) -> bool

impl<K, V> Len for HashMap<K, V>

fn len(&self) -> usize

fn is_empty(&self) -> bool

impl<T> Len for BTreeSet<T>

fn len(&self) -> usize

fn is_empty(&self) -> bool

impl<T> Len for VecDeque<T>

fn len(&self) -> usize

fn is_empty(&self) -> bool

impl<T> Len for Vec<T>

fn len(&self) -> usize

fn is_empty(&self) -> bool

impl<T> Len for HashSet<T>

fn len(&self) -> usize

fn is_empty(&self) -> bool

Implementors