Trait Foldable 

pub trait Foldable: Sized {
    type Elm;

    // Required methods
    fn fold_left<B, F>(&self, b: B, f: F) -> B
       where F: Fn(B, &Self::Elm) -> B;
    fn fold_right<B, F>(&self, b: B, f: F) -> B
       where F: Fn(&Self::Elm, B) -> B;
}

Required Associated Types

type Elm

Required Methods

fn fold_left<B, F>(&self, b: B, f: F) -> B

where F: Fn(B, &Self::Elm) -> B,

fn fold_right<B, F>(&self, b: B, f: F) -> B

where F: Fn(&Self::Elm, B) -> B,

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<A> Foldable for Vec<A>

type Elm = A

fn fold_left<B, F>(&self, b: B, f: F) -> B

where F: Fn(B, &Self::Elm) -> B,

fn fold_right<B, F>(&self, b: B, f: F) -> B

where F: Fn(&Self::Elm, B) -> B,

Implementors