Reading tuple from a line

read_tuple.rs

// Reading tuple from a line
// Example : read_tuple( "1 ab 3"
//                      ,(i32, String, i32))
//  Expected :  (1, "ab", 3)
macro_rules! read_tuple {
    (
        $input:ident, ($($t:ty),*)
    ) => {
    {
        let mut ws = $input.trim().split(" ");
        (
            $(ws.next().unwrap().parse::<$t>(),)*
        )
    }
        
    }
}

fn main() {
    let  _x = "1 ab 3";
    let a  = read_tuple!( _x, (i32, String, i32));

    print!("{:?}",a);
}

if need a default value in case it goes wrong, then

macro_rules! read_tuple2 {
    ( $input:ident, ($($t:ty),*) ) => { {
        let mut ws = $input.trim().split(" ");
        (  $(ws.next().unwrap().parse::<$t>().unwrap_or(Default::default()),)*   )
    }}
}

fn main() {
    let  _x = "1 ab true";
    let a  = read_tuple2!( _x, (i32, String, bool));

    print!("{:?}",a);
}