Trait SimpleCollectionRef 

pub trait SimpleCollectionRef: CollectionRef {
    // Required method
    fn into_ref<'r>(r: Self::ItemRef<'r>) -> &'r Self::Item
       where Self: 'r;
}

Collection where each item reference can be converted into a standard “simple” rust reference.

This trait is particularly useful to avoid having to include where bounds of the form for<'r> T::ItemRef<'r>: Into<&'r T::Item>, which can currently lead the compiler to try to prove T: 'static (see https://github.com/rust-lang/rust/pull/96709#issuecomment-1182403490) for more details.

Required Methods

fn into_ref<'r>(r: Self::ItemRef<'r>) -> &'r Self::Item

where Self: 'r,

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, V> SimpleCollectionRef for BTreeMap<K, V>

fn into_ref<'r>(r: Self::ItemRef<'r>) -> &'r Self::Item

where Self: 'r,

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

fn into_ref<'r>(r: Self::ItemRef<'r>) -> &'r Self::Item

where Self: 'r,

impl<T> SimpleCollectionRef for BTreeSet<T>

fn into_ref<'r>(r: Self::ItemRef<'r>) -> &'r Self::Item

where Self: 'r,

impl<T> SimpleCollectionRef for VecDeque<T>

fn into_ref<'r>(r: Self::ItemRef<'r>) -> &'r Self::Item

where Self: 'r,

impl<T> SimpleCollectionRef for Vec<T>

fn into_ref<'r>(r: Self::ItemRef<'r>) -> &'r Self::Item

where Self: 'r,

impl<T> SimpleCollectionRef for HashSet<T>

fn into_ref<'r>(r: Self::ItemRef<'r>) -> &'r Self::Item

where Self: 'r,

Implementors