Debugging Macros

Macros สำหรับ debugging และ development

dbg! Macro

fn factorial(n: u32) -> u32 {
    if dbg!(n <= 1) {
        dbg!(1)
    } else {
        dbg!(n * factorial(n - 1))
    }
}

fn main() {
    // Basic usage - prints file, line, expression, and value
    let x = 42;
    dbg!(x);  // [src/main.rs:XX] x = 42

    // Returns the value
    let y = dbg!(5 * 10);
    println!("y = {}", y);

    // Works in expressions
    let sum = dbg!(2 + 2) + dbg!(3 + 3);
    println!("sum = {}", sum);

    // Multiple values
    dbg!("hello", 1, 2, 3);

    // Complex expressions
    let vec = vec![1, 2, 3];
    dbg!(&vec);
    dbg!(vec.len());
    dbg!(vec.iter().sum::<i32>());

    println!("\n=== Factorial ===");
    let result = factorial(4);
    println!("Result: {}", result);
}