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Trait EitherErrExt

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pub trait EitherErrExt<T, A, B> {
    // Required methods
    fn map_err_left<F, U>(self, f: F) -> Result<T, Either<U, B>>
       where F: FnOnce(A) -> U;
    fn map_err_right<F, U>(self, f: F) -> Result<T, Either<A, U>>
       where F: FnOnce(B) -> U;
}
Available on crate feature either only.
Expand description

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

Required Methods§

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fn map_err_left<F, U>(self, f: F) -> Result<T, Either<U, B>>
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.

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fn map_err_right<F, U>(self, f: F) -> Result<T, Either<A, U>>
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§

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impl<T, A, B> EitherErrExt<T, A, B> for Result<T, Either<A, B>>

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fn map_err_left<F, U>(self, f: F) -> Result<T, Either<U, B>>
where F: FnOnce(A) -> U,

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fn map_err_right<F, U>(self, f: F) -> Result<T, Either<A, U>>
where F: FnOnce(B) -> U,

Implementors§