Trait Optional 

pub trait Optional<T>: Default + From<T> {
    // Required methods
    fn to_option_ref(&self) -> Option<&T>;
    fn to_option_mut(&mut self) -> Option<&mut T>;
    fn into_option(self) -> Option<T>;
}

A trait that represents an optional value.

This is a complement to std::option::Option that allows implementations to choose how to represent Some and None.

Required Methods

fn to_option_ref(&self) -> Option<&T>

Returns an Option<&T> that is equivalent to this Optional.

fn to_option_mut(&mut self) -> Option<&mut T>

Returns an Option<&mut T> that is equivalent to this Optional.

fn into_option(self) -> Option<T>

Converts this Optional to the equivalent Option.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<T> Optional<T> for Option<T>

fn to_option_ref(&self) -> Option<&T>

fn to_option_mut(&mut self) -> Option<&mut T>

fn into_option(self) -> Option<T>

Implementors

impl Optional<bool> for OptionalBool

impl<T, B> Optional<T> for Optioned<T, B>

where T: Eq, B: BuildNone<T>,