bi_transformer_once_demo/
bi_transformer_once_demo.rs

1/*******************************************************************************
2 *
3 *    Copyright (c) 2025.
4 *    3-Prism Co. Ltd.
5 *
6 *    All rights reserved.
7 *
8 ******************************************************************************/
9//! BiTransformerOnce usage examples
10
11use prism3_function::{BiTransformerOnce, BoxBiTransformerOnce};
12
13fn main() {
14    println!("=== BiTransformerOnce Examples ===\n");
15
16    // Example 1: Basic usage with closure
17    println!("1. Basic usage with closure:");
18    let add = |x: i32, y: i32| x + y;
19    let result = add.apply(20, 22);
20    println!("   20 + 22 = {}", result);
21
22    // Example 2: BoxBiTransformerOnce with new
23    println!("\n2. BoxBiTransformerOnce with new:");
24    let multiply = BoxBiTransformerOnce::new(|x: i32, y: i32| x * y);
25    println!("   6 * 7 = {}", multiply.apply(6, 7));
26
27    // Example 3: Constant transformer
28    println!("\n3. Constant transformer:");
29    let constant = BoxBiTransformerOnce::constant("hello");
30    println!("   constant(123, 456) = {}", constant.apply(123, 456));
31
32    // Example 4: Consuming owned values
33    println!("\n4. Consuming owned values:");
34    let concat = BoxBiTransformerOnce::new(|x: String, y: String| format!("{} {}", x, y));
35    let s1 = String::from("hello");
36    let s2 = String::from("world");
37    let result = concat.apply(s1, s2);
38    println!("   concat('hello', 'world') = {}", result);
39
40    // Example 5: Conditional transformation with when/or_else
41    println!("\n5. Conditional transformation (positive numbers):");
42    let add = BoxBiTransformerOnce::new(|x: i32, y: i32| x + y);
43    let multiply = BoxBiTransformerOnce::new(|x: i32, y: i32| x * y);
44    let conditional = add
45        .when(|x: &i32, y: &i32| *x > 0 && *y > 0)
46        .or_else(multiply);
47    println!("   conditional(5, 3) = {} (add)", conditional.apply(5, 3));
48
49    println!("\n6. Conditional transformation (negative numbers):");
50    let add2 = BoxBiTransformerOnce::new(|x: i32, y: i32| x + y);
51    let multiply2 = BoxBiTransformerOnce::new(|x: i32, y: i32| x * y);
52    let conditional2 = add2
53        .when(|x: &i32, y: &i32| *x > 0 && *y > 0)
54        .or_else(multiply2);
55    println!(
56        "   conditional(-5, 3) = {} (multiply)",
57        conditional2.apply(-5, 3)
58    );
59
60    // Example 7: Conditional with closure in or_else
61    println!("\n7. Conditional with closure in or_else:");
62    let add3 = BoxBiTransformerOnce::new(|x: i32, y: i32| x + y);
63    let conditional3 = add3
64        .when(|x: &i32, y: &i32| *x > 0 && *y > 0)
65        .or_else(|x: i32, y: i32| x * y);
66    println!("   conditional(4, 6) = {}", conditional3.apply(4, 6));
67
68    // Example 8: Merging vectors
69    println!("\n8. Merging vectors:");
70    let merge = BoxBiTransformerOnce::new(|mut x: Vec<i32>, y: Vec<i32>| {
71        x.extend(y);
72        x
73    });
74    let v1 = vec![1, 2, 3];
75    let v2 = vec![4, 5, 6];
76    let result = merge.apply(v1, v2);
77    println!("   merge([1, 2, 3], [4, 5, 6]) = {:?}", result);
78
79    // Example 9: Complex transformation with calculation
80    println!("\n9. Complex transformation with calculation:");
81    let calculate = BoxBiTransformerOnce::new(|x: i32, y: i32| {
82        let sum = x + y;
83        let product = x * y;
84        (sum, product)
85    });
86    let (sum, product) = calculate.apply(5, 3);
87    println!("   calculate(5, 3) = (sum: {}, product: {})", sum, product);
88
89    // Example 10: String manipulation
90    println!("\n10. String manipulation:");
91    let process = BoxBiTransformerOnce::new(|x: String, y: String| {
92        format!("{} {} {}", x.to_uppercase(), "and", y.to_lowercase())
93    });
94    println!(
95        "   process('Hello', 'WORLD') = {}",
96        process.apply("Hello".to_string(), "WORLD".to_string())
97    );
98
99    // Example 11: Converting to function
100    println!("\n11. Converting to function:");
101    let add4 = BoxBiTransformerOnce::new(|x: i32, y: i32| x + y);
102    let f = add4.into_fn();
103    println!("   f(10, 20) = {}", f(10, 20));
104
105    // Example 12: Converting to box (zero-cost)
106    println!("\n12. Converting to box (zero-cost):");
107    let add5 = BoxBiTransformerOnce::new(|x: i32, y: i32| x + y);
108    let boxed = add5.into_box();
109    println!("   boxed(15, 25) = {}", boxed.apply(15, 25));
110
111    println!("\n=== All examples completed successfully! ===");
112}
bi_transformer_once_demo/bi_transformer_once_demo.rs

bi_transformer_once_demo/
bi_transformer_once_demo.rs
