Trait new_type_derive::NewTypeRef

pub trait NewTypeRef {
    type Owned: AsRef<Self>;
    type InnerRef: ?Sized;
    type ValidationError;
    fn to_owned(&self) -> Self::Owned;

    fn validate(value: &Self::InnerRef) -> Result<(), Self::ValidationError> { ... }
}

A trait that provides necessary operations for creating a new type with reference type that can round-trip between the two types and the original wrapped value.

Associated Types

type Owned: AsRef<Self>

The owned type, must be able to take Self as a reference.

type InnerRef: ?Sized

The type of the inner value for the reference type, e.g. str or [u8].

Currently only str is supported.

type ValidationError

The error type that is returned in the event validation fails.

Required Methods

fn to_owned(&self) -> Self::Owned

Convert the reference into an owned value.

The implementation of this must not fail in order for valid values to round-trip between the owned and reference wrappers.

Provided Methods

fn validate(value: &Self::InnerRef) -> Result<(), Self::ValidationError>

Validate the value before allowing it to be wrapped in the new type.

Implementors