Rust impl_trait Optional

main.rs

​
trait Optional<T>: Into<Option<T>> {}
impl<T> Optional<T> for T where T: Into<Option<T>> {}
impl<T> Optional<T> for Option<T> {}



fn test<T: Optional<bool>>(test_type: T) -> bool {
    let test_type = match test_type.into() {
        Some(test) => test,
        None => false,
    };
    test_type
}


pub fn main() {
    println!("{}", test(Some(true)));
    println!("{}", test(None));
    println!("{}", test(false));
    println!("{}", test(true));
}