:* Integer to initialize node's value. Defaults to a default constructed int.
:* Pointer to next node in list. Defaults to NULL.
; Copy Constructor: Initializes internal value as a copy of the source's internal value. Sets this object's next to NULL.
; Standard Assignment Operator: Assigns source's internal value to the current object's internal value. Sets this object's next to NULL. Does not alter the object in the case of self-assignment. Returns a reference to the current object.