Trait fera_graph::prelude::Optional

pub trait Optional<T>: Default + From<T> {
    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.

Implementations on Foreign Types

impl<T, B> Optional<T> for Optioned<T, B> where
    B: BuildNone<T>,
    T: Eq, 

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

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

fn into_option(self) -> Option<T>

impl Optional<bool> for OptionalBool

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

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

fn into_option(self) -> Option<bool>

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