Struct BoxConditionalTransformer 

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

BoxConditionalTransformer struct

A conditional transformer that only executes when a predicate is satisfied. Uses BoxTransformer and BoxPredicate for single ownership semantics.

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

Features

• Single Ownership: Not cloneable, consumes self on use
• Conditional Execution: Only transforms when predicate returns true
• Chainable: Can add or_else branch to create if-then-else logic
• Implements Transformer: Can be used anywhere a Transformer is expected

Examples

With or_else Branch

use prism3_function::{Transformer, BoxTransformer};

let double = BoxTransformer::new(|x: i32| x * 2);
let negate = BoxTransformer::new(|x: i32| -x);
let conditional = double.when(|x: &i32| *x > 0).or_else(negate);

assert_eq!(conditional.apply(5), 10); // when branch executed
assert_eq!(conditional.apply(-5), 5); // or_else branch executed

Author

Haixing Hu

Implementations

impl<T, R> BoxConditionalTransformer<T, R>

where T: 'static, R: 'static,

pub fn or_else<F>(self, else_transformer: F) -> BoxTransformer<T, R>

where F: Transformer<T, R> + 'static,

Adds an else branch

Executes the original transformer when the condition is satisfied, otherwise executes else_transformer.

Parameters

• else_transformer - The transformer for the else branch

Returns

Returns a new transformer with if-then-else logic

Trait Implementations

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

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

Formats the value using the given formatter.

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

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

Formats the value using the given formatter.