Struct signalo_sources::peek::Peek

pub struct Peek<T, U> { /* fields omitted */ }

A source wrapper that caches the wrapped inner source.

Implementations

impl<T, U> Peek<T, U> where
    T: Source<Output = U>, 

pub fn peek(&mut self) -> Option<&U>

Returns the most recent value returned from self.source(), otherwise None.

Trait Implementations

impl<T: Clone, U: Clone> Clone for Peek<T, U>

fn clone(&self) -> Peek<T, U>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug, U: Debug> Debug for Peek<T, U>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T, U> Default for Peek<T, U> where
    T: Default, 

fn default() -> Self

Returns the “default value” for a type.

impl<T, U> From<T> for Peek<T, U>

fn from(inner: T) -> Self

Performs the conversion.

impl<T, U> Source for Peek<T, U> where
    T: Source<Output = U>,
    U: Clone, 

type Output = U

The source’s output type.

fn source(&mut self) -> Option<Self::Output>

Produces the next value in the stream of values.