Struct Opt

pub struct Opt<T>(pub T);

Rule to apply another rule to inner value of an Option

In case of a None value, it just return Ok(())

Example

use type_rules::prelude::*;

#[derive(Validator)]
struct Parameters {
    #[rule(Opt(MinMaxRange(1, 4)))]
    optional_parameter: Option<u32>,
}

let param = Parameters { optional_parameter: Some(1) };
assert!(param.check_validity().is_ok());

let param = Parameters { optional_parameter: None };
assert!(param.check_validity().is_ok());

let param = Parameters { optional_parameter: Some(5) };
assert!(param.check_validity().is_err());

Tuple Fields

0: T

Trait Implementations

impl<T, U: Rule<T>> Rule<Option<T>> for Opt<U>

fn check(&self, value: &Option<T>) -> Result<(), String>