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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 ); (1) (since C++17) template< class P > (2) (since C++11) iterator insert( P&& value ); iterator insert( const_iterator hint, const value_type& value ); (3) (since C++11) iterator insert( const_iterator hint, value_type&& value ); (3) (since C++17) template< class P > (4) (since C++11) iterator insert( const_iterator hint, P&& value ); template< class InputIt > (5) (since C++11) void insert( InputIt first, InputIt last ); 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 hint, node_type&& nh ); (8) (since C++17) Inserts element(s) into the container. 1-2) inserts value. The overload (2) is equivalent to emplace(std::forward<P>(value)) and only participates in overload resolution if std::is_constructible<value_type, P&&>::value == true. 3-4) inserts value, using hint as a non-binding suggestion to where the search should start. The overload (4) is equivalent to emplace_hint(hint, std::forward<P>(value)) and only participates in overload resolution if std::is_constructible<value_type, P&&>::value == true. 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 in- serted element.. 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 hint. The behavior is undefined if nh is not empty and get_allocator() != nh.get_allocator(). If rehashing occurs due to the insertion, all iterators are invali- dated. Otherwise iterators are not affected. References are not invalidated. Rehash- ing occurs only if the new number of elements is greater than max_load_fac- tor()*bucket_count(). 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 1-4) 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 1-4) Average case: O(1), worst case O(size()) 5-6) Average case: O(N), where N is the number of elements to in- sert. Worse case: O(N*size()+N) 7-8) Average case: O(1), worst case O(size()) Example This section is incomplete Reason: no example See also emplace constructs element in-place (C++11) (public member function) emplace_hint constructs elements in-place using a hint (C++11) (public member function) inserter creates a std::insert_iterator of type inferred from the argument (function template) http://cppreference.com 2022.07.31 std::unorde...imap::insert(3)
NAME | Synopsis | Parameters | Type requirements | Return value | Exceptions | Complexity | Example | See also
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