Trait FlattenOptionRefOption 

pub trait FlattenOptionRefOption {
    type Value;

    // Required method
    fn flatten(&self) -> Option<&Self::Value>;
}

Helper trait to implement flatten() on Option<&Option<T>>.

Required Associated Types

type Value

The type of the value contained in the double option.

Required Methods

fn flatten(&self) -> Option<&Self::Value>

Converts from Option<&Option<T>> to Option<&T>.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<'a, T> FlattenOptionRefOption for Option<&'a Option<T>>

type Value = T

fn flatten(&self) -> Option<&'a T>

Implementors