Trait MaybeAsRef 

pub trait MaybeAsRef<T: ?Sized> {
    // Required method
    fn maybe_as_ref(&self) -> Option<&T>;
}

A cheap reference-to-reference conversion that has a possibility to fail.

Required Methods

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

Performs the conversion.

Implementations on Foreign Types

impl<T, U> MaybeAsRef<T> for Option<U>

where U: MaybeAsRef<T>,

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

Implementors

impl<T> MaybeAsRef<SpanContext<T>> for Span<T>

impl<T> MaybeAsRef<SpanContext<T>> for SpanContext<T>