rust implement debug for struct

To implement the Debug trait for a struct in Rust, you can use the derive attribute provided by the language. The derive attribute allows you to automatically generate the implementation of certain traits, including Debug, based on the struct's fields.

Here's an example of implementing Debug for a struct named MyStruct:

#[derive(Debug)]
struct MyStruct {
    field1: u32,
    field2: String,
}

In this example, the #[derive(Debug)] attribute is placed above the struct definition. This tells the Rust compiler to automatically generate the implementation of the Debug trait for MyStruct.

The Debug trait provides a default implementation that prints the struct's fields in a format that is useful for debugging purposes. You can then use the println! macro or the dbg! macro to print an instance of MyStruct:

fn main() {
    let my_struct = MyStruct {
        field1: 42,
        field2: String::from("Hello, world!"),
    };

    println!("{:?}", my_struct); // Using println!
    dbg!(my_struct); // Using dbg!
}

Both the println! macro and the dbg! macro will use the Debug implementation to print my_struct. The output will display the values of field1 and field2:

MyStruct { field1: 42, field2: "Hello, world!" }

That's how you can implement the Debug trait for a struct in Rust!