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Showing content from https://en.cppreference.com/w/cpp/algorithm/../algorithm/../container/multiset/insert.html below:

std::multiset<Key,Compare,Allocator>::insert - cppreference.com

iterator insert( const value_type& value );

(1)

iterator insert( value_type&& value );

(2) (since C++11) (3)

iterator insert( iterator pos, const value_type& value );

(until C++11)

iterator insert( const_iterator pos, const value_type& value );

(since C++11)

iterator insert( const_iterator pos, value_type&& value );

(4) (since C++11)

template< class InputIt > void insert( InputIt first, InputIt last );

(5) (6) (since C++11)

iterator insert( node_type&& nh );

(7) (since C++17)

iterator insert( const_iterator pos, node_type&& nh );

(8) (since C++17)

Inserts element(s) into the container. The order of the remaining equivalent elements is preserved.

1,2) Inserts value. If the container has elements with equivalent key, inserts at the upper bound of that range.

3,4) Inserts value in the position as close as possible to the position just prior to pos.

5) Inserts elements from range [first, last).

6) Inserts elements from initializer list ilist.

7)

nh

is an empty

node handle

, does nothing. Otherwise, inserts the element owned by

nh

into the container and returns an iterator pointing at the inserted element. If a range containing elements with keys equivalent to

nh.key()

exists in the container, the element is inserted at the end of that range. The behavior is undefined if

nh

is not empty and

get_allocator() != nh.get_allocator()

8)

nh

is an empty

node handle

, does nothing and returns the end iterator. Otherwise, inserts the element owned by

nh

into the container, and returns the iterator pointing to the element with key equivalent to

nh.key()

. The element is inserted as close as possible to the position just prior to

pos

. The behavior is undefined if

nh

is not empty and

get_allocator() != nh.get_allocator()

No iterators or references are invalidated. If the insertion is successful, pointers and references to the element obtained while it is held in the node handle are invalidated, and pointers and references obtained to that element before it was extracted become valid.(since C++17)

[edit] Parameters pos - iterator to the position before which the new element will be inserted value - element value to insert first, last - the pair of iterators defining the source range of elements to insert ilist - initializer list to insert the values from nh - a compatible node handle Type requirements -InputIt must meet the requirements of LegacyInputIterator. [edit] Return value

1-4) An iterator to the inserted element.

5,6) (none)

7,8) End iterator if nh was empty, iterator pointing to the inserted element otherwise.

[edit] Exceptions

1-4,7,8) If an exception is thrown by any operation, the insertion has no effect.

5,6) No exception safety guarantee.

[edit] Complexity

1,2,7) O(log(size()))

3,4,8) Amortized constant if the insertion happens in the position just before pos, O(log(size())) otherwise.

5,6) O(N·log(size() + N)), where N is the number of elements to insert.

[edit] Example [edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 233 C++98 pos was just a hint, it could be totally ignored the insertion is required to
be as close as possible to the
position just prior to pos LWG 264 C++98 the complexity of overload (5) was required to be linear if
the range [first, last) is sorted according to Compare removed the linear requirement
in this special case LWG 371 C++98 the order of equivalent elements was not guaranteed to be preserved required to be preserved [edit] See also

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