Difference between revisions of "cpp/container/multiset/insert"
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(Added LWG issue #264 DR (part 2/4).) |
(Clarified amortized constness conditions for insert with hint until C++11) |
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| Line 74: | Line 74: | ||
@1-2@ Logarithmic in the size of the container, {{tt|O(log(size()))}}. | @1-2@ Logarithmic in the size of the container, {{tt|O(log(size()))}}. | ||
| − | @3-4@ Amortized constant if the insertion happens in the position just ''before'' {{c|pos}}, logarithmic in the size of the container otherwise. | + | @3-4@ Amortized constant if the insertion happens in the position just {{rev inl|until=c++11|''after''}} or {{rev inl|since=c++11|''before''}} {{c|pos}}, logarithmic in the size of the container otherwise. |
@5-6@ {{tt|O(N*log(size() + N))}}, where {{tt|N}} is the number of elements to insert. | @5-6@ {{tt|O(N*log(size() + N))}}, where {{tt|N}} is the number of elements to insert. | ||
Revision as of 09:39, 10 January 2023
| 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) | |
| void insert( std::initializer_list<value_type> ilist ); |
(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.
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) If 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) If 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)
Contents |
Parameters
| pos | - | iterator to the position before which the new element will be inserted |
| value | - | element value to insert |
| first, last | - | 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.
| ||
Return value
1-4) Returns an iterator to the inserted element.
5-6) (none)
7,8) End iterator if nh was empty, iterator pointing to the inserted element otherwise.
Exceptions
1-4) If an exception is thrown by any operation, the insertion has no effect.
| This section is incomplete Reason: cases 5-6 |
Complexity
1-2) Logarithmic in the size of the container,
O(log(size())).3-4) Amortized constant if the insertion happens in the position just after(until C++11) or before(since C++11) pos, logarithmic in the size of the container otherwise.
5-6)
O(N*log(size() + N)), where N is the number of elements to insert.7) Logarithmic in the size of the container,
O(log(size())).8) Amortized constant if the insertion happens in the position just before pos, logarithmic in the size of the container otherwise.
Example
| This section is incomplete Reason: no example |
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 |
See also
| (C++11) |
constructs element in-place (public member function) |
| (C++11) |
constructs elements in-place using a hint (public member function) |
| creates a std::insert_iterator of type inferred from the argument (function template) |
