Trait Len 

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

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

A type with a length.

Required Methods

fn len(&self) -> usize

The number of contained elements.

Provided Methods

fn is_empty(&self) -> bool

Whether this contains no elements.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl<A: Len, B: Len, C: Len, D: Len, E: Len, F: Len, G: Len, H: Len, I: Len, J: Len> Len for (A, B, C, D, E, F, G, H, I, J)

fn len(&self) -> usize

impl<A: Len, B: Len, C: Len, D: Len, E: Len, F: Len, G: Len, H: Len, I: Len> Len for (A, B, C, D, E, F, G, H, I)

fn len(&self) -> usize

impl<A: Len, B: Len, C: Len, D: Len, E: Len, F: Len, G: Len, H: Len> Len for (A, B, C, D, E, F, G, H)

fn len(&self) -> usize

impl<A: Len, B: Len, C: Len, D: Len, E: Len, F: Len, G: Len> Len for (A, B, C, D, E, F, G)

fn len(&self) -> usize

impl<A: Len, B: Len, C: Len, D: Len, E: Len, F: Len> Len for (A, B, C, D, E, F)

fn len(&self) -> usize

impl<A: Len, B: Len, C: Len, D: Len, E: Len> Len for (A, B, C, D, E)

fn len(&self) -> usize

impl<A: Len, B: Len, C: Len, D: Len> Len for (A, B, C, D)

fn len(&self) -> usize

impl<A: Len, B: Len, C: Len> Len for (A, B, C)

fn len(&self) -> usize

impl<A: Len, B: Len> Len for (A, B)

fn len(&self) -> usize

impl<A: Len> Len for (A,)

fn len(&self) -> usize

impl<L: Len + ?Sized> Len for &L

fn len(&self) -> usize

impl<L: Len + ?Sized> Len for &mut L

fn len(&self) -> usize

impl<T, const N: usize> Len for [T; N]

fn len(&self) -> usize

impl<T: Len> Len for Arc<T>

fn len(&self) -> usize

impl<T: Len> Len for Rc<T>

fn len(&self) -> usize

impl<T> Len for Vec<T>

fn len(&self) -> usize

impl<T> Len for [T]

fn len(&self) -> usize

Implementors

impl<BC: Len, HC: IndexAs<u64>> Len for Strides<BC, HC>

impl<BC: Len, VC> Len for Strings<BC, VC>

impl<C: ContainerBytes, B: Deref<Target = [u8]>> Len for Stash<C, B>

impl<C: Len> Len for Boxed<C>

impl<CC: CopyAs<u64>> Len for Empties<CC>

impl<CV: Len> Len for Chars<CV>

impl<CV: Len> Len for I128s<CV>

impl<CV: Len> Len for Isizes<CV>

impl<CV: Len> Len for U128s<CV>

impl<CV: Len> Len for Usizes<CV>

impl<CVar: Len, COff: Len + IndexAs<u64>> Len for Discriminant<CVar, COff>

impl<S> Len for Slice<S>

impl<SC, TC, CC, VC: Len, WC: IndexAs<u64>> Len for Results<SC, TC, CC, VC, WC>

impl<SC: Len, NC> Len for Durations<SC, NC>

impl<T, CC, VC: Len, WC: IndexAs<u64>> Len for Options<T, CC, VC, WC>

impl<TC, BC: Len> Len for Trees<TC, BC>

impl<TC, BC: Len> Len for Vecs<TC, BC>

impl<TC, CC, VC: Len, WC: IndexAs<u64>> Len for Repeats<TC, CC, VC, WC>

impl<TC, VC, CC, RC: Len, WC: IndexAs<u64>, const N: u8> Len for Lookbacks<TC, VC, CC, RC, WC, N>

impl<VC: Len, TC: IndexAs<u64>> Len for Bools<VC, TC>

impl<const K: u64, CC: CopyAs<u64>> Len for Fixeds<K, CC>