Struct BoxCallableWith 

pub struct BoxCallableWith<T, R, E> { /* private fields */ }

Box-based callable with mutable input.

BoxCallableWith<T, R, E> stores a Box<dyn FnMut(&mut T) -> Result<R, E>> and can be called repeatedly.

Author

Haixing Hu

Implementations

impl<T, R, E> BoxCallableWith<T, R, E>

pub fn new<F>(function: F) -> Self

where F: FnMut(&mut T) -> Result<R, E> + 'static,

Creates a new callable-with.

Wraps the provided closure in the appropriate smart pointer type for this callable-with implementation.

Examples found in repository

examples/tasks/task_demo.rs (lines 58-61)

fn demo_mutable_input_tasks() {
    println!("--- Mutable-input tasks ---");

    let mut state = 40;
    let mut callable = BoxCallableWith::new(|input: &mut i32| {
        *input += 2;
        Ok::<i32, String>(*input)
    });
    println!("CallableWith result: {:?}", callable.call_with(&mut state));
    println!("State after CallableWith: {state}");

    let mut runnable = BoxRunnableWith::new(|input: &mut i32| {
        *input *= 2;
        Ok::<(), String>(())
    });
    println!("RunnableWith result: {:?}", runnable.run_with(&mut state));
    println!("State after RunnableWith: {state}");
    println!();
}

pub fn new_with_name<F>(name: &str, function: F) -> Self

where F: FnMut(&mut T) -> Result<R, E> + 'static,

Creates a new named callable-with.

Wraps the provided closure and assigns it a name, which is useful for debugging and logging purposes.

pub fn new_with_optional_name<F>(function: F, name: Option<String>) -> Self

where F: FnMut(&mut T) -> Result<R, E> + 'static,

Creates a new named callable-with with an optional name.

Wraps the provided closure and assigns it an optional name.

pub fn name(&self) -> Option<&str>

Gets the name of this callable-with.

Returns

Returns Some(&str) if a name was set, None otherwise.

pub fn set_name(&mut self, name: &str)

Sets the name of this callable-with.

Parameters

• name - The name to set for this callable-with

pub fn clear_name(&mut self)

Clears the name of this callable-with.

pub fn map<U, M>(self, mapper: M) -> BoxCallableWith<T, U, E>

where M: FnMut(R) -> U + 'static, T: 'static, R: 'static, E: 'static,

Maps the success value of this callable.

Parameters

• mapper - Function that transforms the success value.

Returns

A new callable with mutable input that applies mapper on success.

pub fn map_err<E2, M>(self, mapper: M) -> BoxCallableWith<T, R, E2>

where M: FnMut(E) -> E2 + 'static, T: 'static, R: 'static, E: 'static,

Maps the error value of this callable.

Parameters

• mapper - Function that transforms the error value.

Returns

A new callable with mutable input that applies mapper on failure.

pub fn and_then<U, N>(self, next: N) -> BoxCallableWith<T, U, E>

where N: FnMut(R, &mut T) -> Result<U, E> + 'static, T: 'static, R: 'static, E: 'static,

Chains another fallible computation after this callable succeeds.

Parameters

• next - Function receiving the success value and mutable input.

Returns

A new callable that runs next only when this callable succeeds.

Trait Implementations

impl<T, R, E> CallableWith<T, R, E> for BoxCallableWith<T, R, E>

fn call_with(&mut self, input: &mut T) -> Result<R, E>

Executes the boxed callable with mutable input.

fn into_runnable_with(self) -> BoxRunnableWith<T, E>

where Self: Sized + 'static,

Converts this boxed callable into a boxed runnable while preserving its name.

fn into_box(self) -> BoxCallableWith<T, R, E>

Converts this callable into a boxed callable.

fn into_rc(self) -> RcCallableWith<T, R, E>

where Self: 'static,

Converts this callable into an Rc callable.

fn into_fn(self) -> impl FnMut(&mut T) -> Result<R, E>

Converts this callable into a mutable closure.

fn into_arc(self) -> ArcCallableWith<T, R, E>

where Self: Sized + Send + 'static,

Converts this callable into an Arc callable.

impl<T, R, E> Debug for BoxCallableWith<T, R, E>

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

Formats the value using the given formatter.

impl<T, R, E> Display for BoxCallableWith<T, R, E>

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

Formats the value using the given formatter.