Trait BackingContainer 

pub trait BackingContainer<K, V>: Default {
    type Iter<'a>: Iterator<Item = (K, &'a V)>
       where V: 'a,
             Self: 'a;

    // Required methods
    fn insert(&mut self, k: K, v: V);
    fn get(&self, k: &K) -> Option<&V>;
    fn get_mut(&mut self, k: &K) -> Option<&mut V>;
    fn remove(&mut self, k: &K);
    fn iter(&self) -> Self::Iter<'_>;
    fn len(&self) -> usize;

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

Trait for containers that can be wrapped using GroupingContainer.

Required Associated Types

type Iter<'a>: Iterator<Item = (K, &'a V)> where V: 'a, Self: 'a

Type of iterator returned by the BackingContainer::iter method.

Required Methods

fn insert(&mut self, k: K, v: V)

Set the value at the provided key.

fn get(&self, k: &K) -> Option<&V>

Get a reference to the value at the provided key, or None if the value doesn’t exist.

fn get_mut(&mut self, k: &K) -> Option<&mut V>

Get mutable a reference to the value at the provided key, or None if the value doesn’t exist.

fn remove(&mut self, k: &K)

Remove a value with the provided key, if it exists.

fn iter(&self) -> Self::Iter<'_>

Iterate over all (key, value) tuples in the container.

fn len(&self) -> usize

Return the number of elements in the container.

Provided Methods

fn is_empty(&self) -> bool

Return whether the container is empty.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<K: Eq + Hash + Clone, V> BackingContainer<K, V> for HashMap<K, V>

type Iter<'a> = Map<Iter<'a, K, V>, fn((&'a K, &'a V)) -> (K, &'a V)> where K: 'a, V: 'a

fn insert(&mut self, k: K, v: V)

fn get(&self, k: &K) -> Option<&V>

fn get_mut(&mut self, k: &K) -> Option<&mut V>

fn remove(&mut self, k: &K)

fn iter(&self) -> Self::Iter<'_>

fn len(&self) -> usize

impl<V> BackingContainer<usize, V> for Vec<Option<V>>

type Iter<'a> = FilterMap<Enumerate<Iter<'a, Option<V>>>, fn((usize, &'a Option<V>)) -> Option<(usize, &'a V)>> where V: 'a

fn insert(&mut self, k: usize, v: V)

fn get(&self, k: &usize) -> Option<&V>

fn get_mut(&mut self, k: &usize) -> Option<&mut V>

fn remove(&mut self, k: &usize)

fn iter(&self) -> Self::Iter<'_>

fn len(&self) -> usize

Implementors