You could use From::from
:
use std::convert::*;
struct NewType(pub i32);
impl From<NewType> for i32 {
fn from(src: NewType) -> i32 {
src.0
}
}
fn main() {
let a = NewType(5);
println!("{}", i32::from(a));
}
You can read more about it in the docs for the convert
module.