Struct Callback 

pub struct Callback<IN, OUT = ()> { /* private fields */ }

Universal callback wrapper.

An Rc wrapper is used to make it cloneable.

Implementations

impl<IN, OUT> Callback<IN, OUT>

pub fn emit(&self, value: IN) -> OUT

Calls the callback’s function.

impl<IN> Callback<IN>

pub fn noop() -> Self

Creates a “no-op” callback which can be used when it is not suitable to use an Option<Callback>.

impl<IN: 'static, OUT: 'static> Callback<IN, OUT>

pub fn reform<F, T>(&self, func: F) -> Callback<T, OUT>

where F: Fn(T) -> IN + 'static,

Creates a new callback from another callback and a function. When emitted, calls func first, then emits the result to the original callback.

pub fn filter_reform<F, T>(&self, func: F) -> Callback<T, Option<OUT>>

where F: Fn(T) -> Option<IN> + 'static,

Creates a new callback from another callback and a function. When emitted will call the function and, only if it returns Some(value), will emit value to the original callback.

Trait Implementations

impl<IN, OUT> Clone for Callback<IN, OUT>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<IN, OUT> Debug for Callback<IN, OUT>

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

Formats the value using the given formatter.

impl<IN> Default for Callback<IN>

fn default() -> Self

Returns the “default value” for a type.

impl<IN, OUT, F: Fn(IN) -> OUT + 'static> From<F> for Callback<IN, OUT>

fn from(func: F) -> Self

Converts to this type from the input type.

impl<IN, OUT> PartialEq for Callback<IN, OUT>

fn eq(&self, other: &Callback<IN, OUT>) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.