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_once(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_once(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_once(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_once(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!(
48        "   conditional(5, 3) = {} (add)",
49        conditional.apply_once(5, 3)
50    );
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_once(-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_once(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_once(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_once(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_once("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_once();
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_once();
112    println!("   boxed(15, 25) = {}", boxed.apply_once(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
