bi_transformer_once_demo/
bi_transformer_once_demo.rs

1/*******************************************************************************
2 *
3 *    Copyright (c) 2025 - 2026.
4 *    Haixing Hu, Qubit Co. Ltd.
5 *
6 *    All rights reserved.
7 *
8 ******************************************************************************/
9//! BiTransformerOnce usage examples
10
11use qubit_function::{
12    BiTransformerOnce,
13    BoxBiTransformerOnce,
14};
15
16fn main() {
17    println!("=== BiTransformerOnce Examples ===\n");
18
19    // Example 1: Basic usage with closure
20    println!("1. Basic usage with closure:");
21    let add = |x: i32, y: i32| x + y;
22    let result = add.apply(20, 22);
23    println!("   20 + 22 = {}", result);
24
25    // Example 2: BoxBiTransformerOnce with new
26    println!("\n2. BoxBiTransformerOnce with new:");
27    let multiply = BoxBiTransformerOnce::new(|x: i32, y: i32| x * y);
28    println!("   6 * 7 = {}", multiply.apply(6, 7));
29
30    // Example 3: Constant transformer
31    println!("\n3. Constant transformer:");
32    let constant = BoxBiTransformerOnce::constant("hello");
33    println!("   constant(123, 456) = {}", constant.apply(123, 456));
34
35    // Example 4: Consuming owned values
36    println!("\n4. Consuming owned values:");
37    let concat = BoxBiTransformerOnce::new(|x: String, y: String| format!("{} {}", x, y));
38    let s1 = String::from("hello");
39    let s2 = String::from("world");
40    let result = concat.apply(s1, s2);
41    println!("   concat('hello', 'world') = {}", result);
42
43    // Example 5: Conditional transformation with when/or_else
44    println!("\n5. Conditional transformation (positive numbers):");
45    let add = BoxBiTransformerOnce::new(|x: i32, y: i32| x + y);
46    let multiply = BoxBiTransformerOnce::new(|x: i32, y: i32| x * y);
47    let conditional = add
48        .when(|x: &i32, y: &i32| *x > 0 && *y > 0)
49        .or_else(multiply);
50    println!("   conditional(5, 3) = {} (add)", conditional.apply(5, 3));
51
52    println!("\n6. Conditional transformation (negative numbers):");
53    let add2 = BoxBiTransformerOnce::new(|x: i32, y: i32| x + y);
54    let multiply2 = BoxBiTransformerOnce::new(|x: i32, y: i32| x * y);
55    let conditional2 = add2
56        .when(|x: &i32, y: &i32| *x > 0 && *y > 0)
57        .or_else(multiply2);
58    println!(
59        "   conditional(-5, 3) = {} (multiply)",
60        conditional2.apply(-5, 3)
61    );
62
63    // Example 7: Conditional with closure in or_else
64    println!("\n7. Conditional with closure in or_else:");
65    let add3 = BoxBiTransformerOnce::new(|x: i32, y: i32| x + y);
66    let conditional3 = add3
67        .when(|x: &i32, y: &i32| *x > 0 && *y > 0)
68        .or_else(|x: i32, y: i32| x * y);
69    println!("   conditional(4, 6) = {}", conditional3.apply(4, 6));
70
71    // Example 8: Merging vectors
72    println!("\n8. Merging vectors:");
73    let merge = BoxBiTransformerOnce::new(|mut x: Vec<i32>, y: Vec<i32>| {
74        x.extend(y);
75        x
76    });
77    let v1 = vec![1, 2, 3];
78    let v2 = vec![4, 5, 6];
79    let result = merge.apply(v1, v2);
80    println!("   merge([1, 2, 3], [4, 5, 6]) = {:?}", result);
81
82    // Example 9: Complex transformation with calculation
83    println!("\n9. Complex transformation with calculation:");
84    let calculate = BoxBiTransformerOnce::new(|x: i32, y: i32| {
85        let sum = x + y;
86        let product = x * y;
87        (sum, product)
88    });
89    let (sum, product) = calculate.apply(5, 3);
90    println!("   calculate(5, 3) = (sum: {}, product: {})", sum, product);
91
92    // Example 10: String manipulation
93    println!("\n10. String manipulation:");
94    let process = BoxBiTransformerOnce::new(|x: String, y: String| {
95        format!("{} {} {}", x.to_uppercase(), "and", y.to_lowercase())
96    });
97    println!(
98        "   process('Hello', 'WORLD') = {}",
99        process.apply("Hello".to_string(), "WORLD".to_string())
100    );
101
102    // Example 11: Converting to function
103    println!("\n11. Converting to function:");
104    let add4 = BoxBiTransformerOnce::new(|x: i32, y: i32| x + y);
105    let f = add4.into_fn();
106    println!("   f(10, 20) = {}", f(10, 20));
107
108    // Example 12: Converting to box (zero-cost)
109    println!("\n12. Converting to box (zero-cost):");
110    let add5 = BoxBiTransformerOnce::new(|x: i32, y: i32| x + y);
111    let boxed = add5.into_box();
112    println!("   boxed(15, 25) = {}", boxed.apply(15, 25));
113
114    println!("\n=== All examples completed successfully! ===");
115}
bi_transformer_once_demo/bi_transformer_once_demo.rs

bi_transformer_once_demo/
bi_transformer_once_demo.rs
