Trait EitherOkExt

pub trait EitherOkExt<E, A, B> {
    // Required methods
    fn map_left<F, U>(self, f: F) -> Result<Either<U, B>, E>
       where F: FnOnce(A) -> U;
    fn map_right<F, U>(self, f: F) -> Result<Either<A, U>, E>
       where F: FnOnce(B) -> U;
}

Available on crate feature either only.

An extension trait for Result<Either<A, B>, _> that provides additional methods.

Required Methods

fn map_left<F, U>(self, f: F) -> Result<Either<U, B>, E>

where F: FnOnce(A) -> U,

Apply the function f on the value in the Left variant if it is present rewrapping the result in Left.

fn map_right<F, U>(self, f: F) -> Result<Either<A, U>, E>

where F: FnOnce(B) -> U,

Apply the function f on the value in the Right variant if it is present rewrapping the result in Right.

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl<E, A, B> EitherOkExt<E, A, B> for Result<Either<A, B>, E>

fn map_left<F, U>(self, f: F) -> Result<Either<U, B>, E>

where F: FnOnce(A) -> U,

fn map_right<F, U>(self, f: F) -> Result<Either<A, U>, E>

where F: FnOnce(B) -> U,

Implementors