Things I still need reminders on when implementing models around Options etc

notes.rs

//take
OPTION.take() == mem::replace(OPTION, None)
//map
if let Some(value) = OPTION { *value = 42; } == OPTION.map(|value| *value = 36);

//Drop for boxed recursive options
impl Drop for Class {
    fn drop(&mut self) {
        let mut current = class_ref.take();
        while let Some(mut boxed_ref) = current {
            current = boxed_ref.next.take();
        }
    }
}

//Iter
pub trait Iterator {
    type Item;
    fn next(&mut self) -> Option<Self::Item>;
}