Trait Len 

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

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

Trait implemented by types that can provide a length. Values used for InspectableLen must implement this.

Required Methods

fn len(&self) -> usize

Provided Methods

fn is_empty(&self) -> bool

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl<V> Len for HashSet<V>

fn len(&self) -> usize

impl<V> Len for Vec<V>

fn len(&self) -> usize

Implementors