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std::unorde...imap::insert(3) C++ Standard Libarystd::unorde...imap::insert(3) NAME std::unordered_multimap::insert - std::unordered_multimap::insert Synopsis Defined in header <unordered_map> iterator insert( const value_type& value ); (1) (since C++11) iterator insert( value_type&& value ); (2) (since C++17) template< class P > (3) (since C++11) iterator insert( P&& value ); iterator insert( const_iterator hint, const value_type& value ); (4) (since C++11) iterator insert( const_iterator hint, value_type&& value ); (5) (since C++17) template< class P > (6) (since C++11) iterator insert( const_iterator hint, P&& value ); template< class InputIt > (7) (since C++11) void insert( InputIt first, InputIt last ); void insert( std::initializer_list<value_type> ilist ); (8) (since C++11) iterator insert( node_type&& nh ); (9) (since C++17) iterator insert( const_iterator hint, node_type&& nh ); (10) (since C++17) Inserts element(s) into the container. 1-3) Inserts value. Overload (3) is equivalent to emplace(std::forward<P>(value)) and only participates in overload resolution if std::is_constructible<value_type, P&&>::value == true. 4-6) Inserts value, using hint as a non-binding suggestion to where the search should start. Overload (6) is equivalent to emplace_hint(hint, std::for- ward<P>(value)) and only participates in overload resolution if std::is_con- structible<value_type, P&&>::value == true. 7) Inserts elements from range [first, last). If [first, last) is not a valid range, or first and/or last are it- erators into *this, the behavior is undefined. 8) Inserts elements from initializer list ilist. 9) 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 in- serted element. The behavior is undefined if nh is not empty and get_allocator() != nh.get_allocator(). 10) 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(). hint is used as a non-binding suggestion to where the search should start. The behav- ior is undefined if nh is not empty and get_allocator() != nh.get_allocator(). If after the operation the new number of elements is greater than old max_load_factor() * bucket_count() a rehashing takes place. If rehashing occurs (due to the insertion), all iterators are inval- idated. Otherwise (no rehashing), iterators are not invalidated. If the insertion is successful, pointers and references to the ele- ment 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) Parameters hint - iterator, used as a suggestion as to where to insert the content 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 1-6) An iterator to the inserted element. 7,8) (none) 9,10) End iterator if nh was empty, iterator pointing to the in- serted element otherwise. Exceptions 1-6) If an exception is thrown for any reason, these functions have no effect (strong exception safety guarantee). 7,8) No exception safety guarantee. 9,10) If an exception is thrown for any reason, these functions have no effect (strong exception safety guarantee). Complexity 1-6) Average case: O(1), worst case O(size()). 7,8) Average case: O(N), where N is the number of elements to in- sert. Worst case: O(N * size() + N). 9,10) Average case: O(1), worst case O(size()). Example This section is incomplete Reason: no example Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Cor- rect behavior overloads (3,6) would only only par- ticipates if LWG 2005 C++11 participate in overload value_type resolution if P is implicitly is con- structible from P&& convertible to value_type See also emplace constructs element in-place (public member function) emplace_hint constructs elements in-place using a hint (public member function) inserter creates a std::insert_iterator of type inferred from the argument (function template) Category: * Todo no example http://cppreference.com 2024.06.10 std::unorde...imap::insert(3)
NAME | Synopsis | Parameters | Type requirements | Return value | Exceptions | Complexity | Example | See also | Category:
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