Enum Deferred 

pub enum Deferred<T> {
    Now(T),
    Later(usize),
}

A value that is either immediately available or deferred.

Variants

Now(T)

Available immediately.

Later(usize)

Will be computed later (opaque handle).

Implementations

impl<T: Clone> Deferred<T>

pub fn now(v: T) -> Self

Create an immediate value.

pub fn later(id: usize) -> Self

Create a deferred handle.

pub fn is_ready(&self) -> bool

Check if immediately available.

pub fn resolve_or<F: FnOnce(usize) -> T>(self, f: F) -> T

Unwrap the immediate value, or call f with the handle.

pub fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Deferred<U>

Map over an immediate value.

Trait Implementations

impl<T: Clone> Clone for Deferred<T>

fn clone(&self) -> Deferred<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Deferred<T>

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

Formats the value using the given formatter.