set<Key, Compare, Alloc>
The C++ Set is an associative STL container that contains a sorted set of unique objects of type Key. Sorting is done using the key comparison function Compare (default is set to std::less<Key>).
| Constructors | default methods to allocate, copy, and deallocate sets | 
| Operators | assign and compare sets | 
| begin | returns an iterator to the beginning of the set | 
| clear | removes all elements from the set | 
| count | returns the number of elements matching a certain key | 
| empty | true if the set has no elements | 
| end | returns an iterator just past the last element of a set | 
| equal_range | returns iterators to the first and just past the last elements matching a specific key | 
| erase | removes elements from a set | 
| find | returns an iterator to specific element | 
| insert | insert items into a set | 
| key_comp | returns the function that compares keys | 
| lower_bound | returns an iterator to the first element greater than or equal to a certain value | 
| max_size | returns the maximum number of elements that the set can hold | 
| rbegin | returns a reverse_iterator to the end of the set | 
| rend | returns a reverse_iterator to the beginning of the set | 
| size | returns the number of items in the set | 
| swap | swap the contents of this set with another | 
| upper_bound | returns an iterator to the first element greater than a certain value | 
| value_comp | returns the function that compares values |