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pub mod container_constructor;
pub trait Container<T> {
fn len(&mut self) -> usize;
fn contains(&mut self, x: &T) -> bool;
fn is_empty(&mut self) -> bool;
fn insert(&mut self, elt: T);
fn clear(&mut self);
fn remove(&mut self, elt: T) -> Option<T>; // remove first occurance
}
pub trait Stack<T> {
fn push(&mut self, elt: T);
fn pop(&mut self) -> Option<T>;
}
pub trait Indexable<T> {
fn first(&mut self) -> Option<&T>;
fn last(&mut self) -> Option<&T>;
fn nth(&mut self, n: usize) -> Option<&T>;
}
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