Trait prae::Guard[−][src]

pub trait Guard {
    type Target;
    type Error;
    fn adjust(v: &mut Self::Target);
    fn validate(v: &Self::Target) -> Option<Self::Error>;
}

Expand description

A trait that represents a guard bound, e.g. a type that is being guarded, adjust/validate functions and a possible validation error.

Associated Types

type Target

The type that is being guarded.

type Error

An error that will be returned in case of failed validation.

fn adjust(v: &mut Self::Target)

A function that can make small adjustments of the provided value before validation.

fn validate(v: &Self::Target) -> Option<Self::Error>

A function that validates provided value. If the value is not valid, it returns Some(Self::Error).