Data.Vinyl.Idiom.Validation

Documentation

data Result e a

A type which is similar to Either, except that it has a slightly different Applicative instance.

Constructors

Failure e

Success a

Instances

Functor (Result e)

Monoid e => Applicative (Result e)

The Applicative instance to Result relies on its error type being a Monoid. That way, it can accumulate errors.

(Eq e, Eq a) => Eq (Result e a)

(Show e, Show a) => Show (Result e a)

type Validator e = Identity ~> Result e

Validators transform identities into results.