Struct ArcConditionalStatefulFunction 

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

ArcConditionalStatefulFunction struct

A thread-safe conditional function that only executes when a predicate is satisfied. Uses ArcStatefulFunction and ArcPredicate for shared ownership across threads.

This type is typically created by calling ArcStatefulFunction::when() and is designed to work with the or_else() method to create if-then-else logic.

Features

• Shared Ownership: Cloneable via Arc, multiple owners allowed
• Thread-Safe: Implements Send, safe for concurrent use
• Conditional Execution: Only maps when predicate returns true
• Chainable: Can add or_else branch to create if-then-else logic

Examples

use prism3_function::{StatefulFunction, ArcStatefulFunction};

let mut function = ArcStatefulFunction::new(|x: i32| x * 2)
    .when(|x: &i32| *x > 0)
    .or_else(|x: i32| -x);

let mut function_clone = function.clone();

assert_eq!(function.apply(5), 10);
assert_eq!(function_clone.apply(-5), 5);

Author

Haixing Hu

Implementations

impl<T, R> ArcConditionalStatefulFunction<T, R>

where T: 'static, R: 'static,

pub fn or_else<F>(&self, else_function: F) -> ArcStatefulFunction<T, R>

where F: StatefulFunction<T, R> + Send + Sync + 'static,

Provides an alternative function for when the predicate is not satisfied

Combines the current conditional function with an alternative function into a new function that implements the following semantics:

When the returned function is called with an argument:

• If the predicate is satisfied, it executes the internal function
• If the predicate is NOT satisfied, it executes the alternative function

Parameters

• else_function - The alternative function to execute when predicate fails

Returns

Returns a new function that handles both conditional branches

Examples

let func = ArcFunction::new(|x: i32| x * 2);
let alternative = ArcFunction::new(|x: i32| x + 10);

let conditional = func.when(|x| *x > 0).or_else(alternative);

assert_eq!(conditional.apply(5), 10);  // 5 * 2 = 10
assert_eq!(conditional.apply(-3), 7);  // -3 + 10 = 7

Trait Implementations

impl<T, R> Clone for ArcConditionalStatefulFunction<T, R>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T, R> Debug for ArcConditionalStatefulFunction<T, R>

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

Formats the value using the given formatter.

impl<T, R> Display for ArcConditionalStatefulFunction<T, R>

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

Formats the value using the given formatter.