Trait dialoguer::Validator

pub trait Validator<T> {
    type Err;

    fn validate(&mut self, input: &T) -> Result<(), Self::Err>;
}

Trait for input validators.

A generic implementation for Fn(&str) -> Result<(), E> is provided to facilitate development.

Required Associated Types

type Err

Required Methods

fn validate(&mut self, input: &T) -> Result<(), Self::Err>

Invoked with the value to validate.

If this produces Ok(()) then the value is used and parsed, if an error is returned validation fails with that error.

Implementors

impl<T, F, E> Validator<T> for F where
    F: FnMut(&T) -> Result<(), E>, 

type Err = E