Trait MapCollection 

pub trait MapCollection {
    type Key;
    type Value;
    type Iter<'a>: Iterator<Item = (&'a Self::Key, &'a Self::Value)> + 'a
       where Self: 'a;

    // Required methods
    fn iter(&self) -> Self::Iter<'_>;
    fn len(&self) -> usize;

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

Explicit iteration contract for generated map wrapper types.

Required Associated Types

type Key

Key type exposed by the map.

type Value

Value type exposed by the map.

type Iter<'a>: Iterator<Item = (&'a Self::Key, &'a Self::Value)> + 'a where Self: 'a

Iterator tied to the borrow of this map.

Required Methods

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

Iterate over the map’s entries.

fn len(&self) -> usize

Return the number of entries in the map.

Provided Methods

fn is_empty(&self) -> bool

Return whether the map contains no entries.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementations on Foreign Types

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

type Key = K

type Value = V

type Iter<'a> = Iter<'a, K, V> where Self: 'a

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

fn len(&self) -> usize

Implementors