Trait Collection 

pub trait Collection {
    type Item;
    type Iter<'a>: Iterator<Item = &'a Self::Item> + '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 list and set wrapper types.

Required Associated Types

type Item

Element type exposed by the collection.

type Iter<'a>: Iterator<Item = &'a Self::Item> + 'a where Self: 'a

Iterator tied to the borrow of this collection.

Required Methods

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

Iterate over the collection’s items.

fn len(&self) -> usize

Return the number of items in the collection.

Provided Methods

fn is_empty(&self) -> bool

Return whether the collection contains no items.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementations on Foreign Types

impl<T> Collection for BTreeSet<T>

type Item = T

type Iter<'a> = Iter<'a, T> where Self: 'a

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

fn len(&self) -> usize

impl<T> Collection for Vec<T>

type Item = T

type Iter<'a> = Iter<'a, T> where Self: 'a

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

fn len(&self) -> usize

Implementors