C++ Multisets are like sets, in that they are associative containers containing a sorted set of objects, but differ in that they allow duplicate objects.
| Multiset Constructors | default methods to allocate, copy, and deallocate multisets |
| Multiset Operators | assign and compare multisets |
| begin | returns an iterator to the beginning of the multiset |
| clear | removes all elements from the multiset |
| count | returns the number of elements matching a certain key |
| empty | true if the multiset has no elements |
| end | returns an iterator just past the last element of a multiset |
| equal_range | returns iterators to the first and just past the last elements matching a specific key |
| erase | removes elements from a multiset |
| find | returns an iterator to specific elements |
| insert | inserts items into a multiset |
| 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 multiset can hold |
| rbegin | returns a reverse_iterator to the end of the multiset |
| rend | returns a reverse_iterator to the beginning of the multiset |
| size | returns the number of items in the multiset |
| swap | swap the contents of this multiset with another |
| upper_bound | returns an iterator to the first element greater than a certain value |
| value_comp | returns the function that compares values |