Trait Functor

pub trait Functor<B>: HKT<B> {
    // Required method
    fn fmap<F>(&self, f: F) -> Self::M
       where F: Fn(&Self::A) -> B;
}

Functor type class

Required Methods

fn fmap<F>(&self, f: F) -> Self::M

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

Functor map

Examples

use funlib::Functor;
let n = Some(1).fmap(|i| i * 4);
assert_eq!(Some(4), n);

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, B> Functor<B> for Option<A>

fn fmap<F>(&self, f: F) -> Option<B>

where F: Fn(&A) -> B,

impl<A, B> Functor<B> for Box<A>

fn fmap<F>(&self, f: F) -> Box<B>

where F: Fn(&A) -> B,

impl<A, B> Functor<B> for Rc<A>

fn fmap<F>(&self, f: F) -> Rc<B>

where F: Fn(&A) -> B,

impl<A, B> Functor<B> for Vec<A>

fn fmap<F>(&self, f: F) -> Vec<B>

where F: Fn(&A) -> B,

Implementors