Rust study : match pointer/reference

match_reference.rs

/*
The rust by example ko https://hanbum.gitbooks.io/rustbyexample/content/flow_control/match/destructuring/destructure_pointers.html
compiled on https://play.rust-lang.org/
result :
Got a value via destructuring 4
Got a value via dereferencing 4
Got a reference to a value 5
We added 10. `mut_value`: 16
mut_value after match : 16
*/

fn main() 
{
    let reference = &4;
    
    match reference {
        &val => println!("Got a value via destructuring {:?}", val),
    }
    
    match *reference {
        val => println!("Got a value via dereferencing {:?}", val),
    }
    
    let _not_a_reference = 3;
    
    let ref _is_a_reference = 3;
    
    let value = 5;
    let mut mut_value = 6;
    
    match value {
        ref r => println!("Got a reference to a value {:?}", r),
    }

    match mut_value {
        ref mut m => {
            *m += 10;
            println!("We added 10. `mut_value`: {:?}", m);
        },
    }
    println!("mut_value after match : {}", mut_value)
}