| abstract class $QUEUE{T} < $DISPENSER{T} |
|---|
| **** | Abstract queue |
| $DISPENSER{_} | $STR | $CONTAINER{_} | $ELT{_} | $ELT |
| A_QUEUE{_} | QUEUE{_} |
| elt!: T; |
|---|
| **** | Return the elements in queue order (without removing them) i.e. return them in the same order as "remove" would |
| enq(elt:T); |
|---|
| **** | Enqueue the element "elt" |
| is_empty: BOOL; |
|---|
| **** | Is the queue empty |
| top: T; |
|---|
| **** | Return the topmost element (alias for current) |
