There is no MFC class CSet, so we have to write our own. Similar to List, Set is a sub class to CList. It has a default constructor and a copy constructor, two methods Add and AddAll which add a value or another set, methods Remove and Exists which remove a given element from the set and decide whether a given value is a member of the set.
template<typename T>
class Set : public CList<T>
{
public:
Set();
Set(const Set<T>& set);
Set<T>& operator=(const Set<T>& set);
void Add(T value);
void AddAll(Set<T>& set);
void Remove(T value);
BOOL Exists(T value) const;
static Set<T> Merge(Set<T> leftSet, Set<T> rightSet,
BOOL bAddEQ, BOOL bAddLT,BOOL bAddGT,
BOOL bAddLeft, BOOL bAddRight);
static Set<T> Union(Set<T> leftSet, Set<T> rightSet);
static Set<T> Intersection(Set<T> leftSet,
...