Struct BoxConditionalTransformerOnce 

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

BoxConditionalTransformerOnce struct

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

This type is typically created by calling BoxTransformerOnce::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
• One-time Use: Can only be called once
• Conditional Execution: Only transforms when predicate returns true
• Chainable: Can add or_else branch to create if-then-else logic

Examples

With or_else Branch

use prism3_function::{TransformerOnce, BoxTransformerOnce};

let double = BoxTransformerOnce::new(|x: i32| x * 2);
let negate = BoxTransformerOnce::new(|x: i32| -x);
let conditional = double.when(|x: &i32| *x > 0).or_else(negate);
assert_eq!(conditional.apply(5), 10); // when branch executed

let double2 = BoxTransformerOnce::new(|x: i32| x * 2);
let negate2 = BoxTransformerOnce::new(|x: i32| -x);
let conditional2 = double2.when(|x: &i32| *x > 0).or_else(negate2);
assert_eq!(conditional2.apply(-5), 5); // or_else branch executed

Author

Haixing Hu

Implementations

impl<T, R> BoxConditionalTransformerOnce<T, R>

where T: 'static, R: 'static,

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

where F: TransformerOnce<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 BoxConditionalTransformerOnce<T, R>

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

Formats the value using the given formatter.

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

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

Formats the value using the given formatter.