Example
use std::ops::Deref;
use std::fmt::Debug;
#[derive(Debug)]
struct RichOption<T>(Option<T>); // wrapper struct
impl<T> Deref for RichOption<T> {
type Target = Option<T>; // Our wrapper struct will coerce into Option
fn deref(&self) -> &Option<T> {
&self.0 // We just extract the inner element
}
}
impl<T: Debug> RichOption<T> {
fn print_inner(&self) {
println!("{:?}", self.0)
}
}
fn main() {
let x = RichOption(Some(1));
println!("{:?}",x.map(|x| x + 1)); // Now we can use Option's methods...
fn_that_takes_option(&x); // pass it to functions that take Option...
x.print_inner() // and use it's own methods to extend Option
}
fn fn_that_takes_option<T : std::fmt::Debug>(x: &Option<T>) {
println!("{:?}", x)
}
