Trait HasLength 

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

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

Trait for data structures which have a length.

Required Methods

fn len(&self) -> usize

Return the length of the data structure.

Provided Methods

fn is_empty(&self) -> bool

Return whether the data structure is empty.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl<A> HasLength for VecDeque<A>

fn len(&self) -> usize

Implementors

impl<'a, A: 'a, const N: usize> HasLength for Slice<'a, A, N>

impl<'a, A: 'a, const N: usize> HasLength for SliceMut<'a, A, N>

impl<A, const N: usize> HasLength for RingBuffer<A, N>