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UList - circular, doubly-linked list class
UList implements a circular, doubly-linked list. The sentinel and each entry in the list are instances of the UList class, each containing a void pointer to the data they contain as well as pointers to the next and previous UList instance in the list. The sentinel UList instance is considered to represent the list.
UList(void* = nil) Create a new UList instance, optionally supplying the value for the void pointer it stores. virtual ~UList() Delete the entire list. Normally the sentinel, which represents the list, is the entry that is deleted explicitly. Note that the data on the list, stored as void*'s, cannot be deleted in this manner. void Append(UList*) void Prepend(UList*) When performed on the sentinel, Append appends an element to the end of the list and Prepend prepends it to the beginning of the list. When performed on a UList instance other than the sentinel, Append has the effect of inserting its argument before the instance, while Prepend has the effect of inserting it after the instance. void Remove(UList*) Unlink the specified UList instance from the list it is in. The object on which this operation is called is irrelevant. void Delete(void*) Find the UList instance in this list containing the given void pointer, remove it from the list it is in, and delete it. UList* Find(void*) Return the UList instance in this list containing the given void pointer. UList* First() UList* Last() UList* End() UList* Next() UList* Prev() Return various UList instance in the list relative to this, i.e., as if it were the sentinel. End returns the sentinel (this) and is useful for detecting the end of an iteration through the list; the other operations are self-explanatory. boolean IsEmpty() Return whether or not the list has any elements. void* operator()() Return the void pointer that the UList stores. UList* operator(int i) Return the ith UList in the list, where the next element is the first, etc.