Trait OptionalIndex

pub trait OptionalIndex<I>
where
    I: ?Sized,
{
    type Output: Clone + ?Sized;

    // Required method
    fn optional_index(&self, index: I) -> Option<&Self::Output>;
}

Optional immutable index.

Required Associated Types

type Output: Clone + ?Sized

Required Methods

fn optional_index(&self, index: I) -> Option<&Self::Output>

Implementations on Foreign Types

impl<T, I> OptionalIndex<I> for Option<T>

where T: OptionalIndex<I>,

type Output = <T as OptionalIndex<I>>::Output

fn optional_index(&self, index: I) -> Option<&Self::Output>

impl<T, I> OptionalIndex<I> for &T

where T: OptionalIndex<I>,

type Output = <T as OptionalIndex<I>>::Output

fn optional_index(&self, index: I) -> Option<&Self::Output>

impl<T, I> OptionalIndex<I> for &mut T

where T: OptionalIndex<I>,

type Output = <T as OptionalIndex<I>>::Output

fn optional_index(&self, index: I) -> Option<&Self::Output>

Implementors