Super-simple scoped lazily-initialised objects, because eager evaluation is for dopes. I am frankly shocked that there is no crate that does this and compiles on any current version of Rust.
Serving suggestion:
let lazy = Lazy::new(|| {
println!("Doing something complicated!");
42
});
println!("{}", *lazy);
println!("{}", *lazy);
println!("{}", *lazy);
/* Prints:
* Doing something complicated!
* 42
* 42
* 42
*/Currently implemented with RefCell, but it will not panic. This class is not thread-safe, the project I made it for will eventually need it to be though, so I'll probably update it to use something thread-safe eventually.