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      std::unordered_multimap<Key,T,Hash,KeyEqual,Allocator>::insert

      From cppreference.com
      <cpp‎ |container‎ |unordered multimap
       
       
       
      std::unordered_multimap
      Member types
      Member functions
      Non-member functions
      Deduction guides(C++17)
       
      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>
      iterator insert( P&& value);
      		 (3)(since C++11)
      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>
      iterator insert( const_iterator hint, P&& value);
      		 (6)(since C++11)
      template<class InputIt>
      void insert( InputIt first, InputIt last);
      		 (7)(since C++11)
      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) Insertsvalue.
      Overload(3) is equivalent toemplace(std::forward<P>(value)) and only participates in overload resolution ifstd::is_constructible<value_type, P&&>::value==true.
      4-6) Insertsvalue, usinghint as a non-binding suggestion to where the search should start.
      Overload(6) is equivalent toemplace_hint(hint,std::forward<P>(value)) and only participates in overload resolution ifstd::is_constructible<value_type, P&&>::value==true.
      7) Inserts elements from range[first, last).
      If[first, last) is not avalid range, orfirst and/orlast are iterators into*this, the behavior is undefined.
      8) Inserts elements from initializer listilist.
      9) Ifnh is an emptynode handle, does nothing. Otherwise, inserts the element owned bynh into the container and returns an iterator pointing at the inserted element. The behavior is undefined ifnh is not empty andget_allocator()!= nh.get_allocator().
      10) Ifnh is an emptynode handle, does nothing and returns the end iterator. Otherwise, inserts the element owned bynh into the container, and returns the iterator pointing to the element with key equivalent tonh.key().hint is used as a non-binding suggestion to where the search should start. The behavior is undefined ifnh is not empty andget_allocator()!= nh.get_allocator().

      If after the operation the new number of elements is greater than oldmax_load_factor() * bucket_count() a rehashing takes place.
      If rehashing occurs (due to the insertion), all iterators are invalidated. Otherwise (no rehashing), iterators are not 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

      [edit]Parameters

      hint - iterator, used as a suggestion as to where to insert the content
      value - element value to insert
      first, last - the pair of iterators defining the sourcerange of elements to insert
      ilist - initializer list to insert the values from
      nh - a compatiblenode handle
      Type requirements
      -
      InputIt must meet the requirements ofLegacyInputIterator.

      [edit]Return value

      1-6) An iterator to the inserted element.
      7,8) (none)
      9,10) End iterator ifnh was empty, iterator pointing to the inserted element otherwise.

      [edit]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).

      [edit]Complexity

      1-6) Average case:O(1), worst caseO(size()).
      7,8) Average case:O(N), where N is the number of elements to insert. Worst case:O(N * size() + N).
      9,10) Average case:O(1), worst caseO(size()).

      [edit]Example

      This section is incomplete
      Reason: no example

      [edit]Defect reports

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

      DRApplied toBehavior as publishedCorrect behavior
      LWG 2005C++11overloads(3,6) would only participate in overload
      resolution ifP is implicitly convertible tovalue_type      		only participates ifvalue_type
      is constructible fromP&&

      [edit]See also

      constructs element in-place
      (public member function)[edit]
      constructs elements in-place using a hint
      (public member function)[edit]
      creates astd::insert_iterator of type inferred from the argument
      (function template)[edit]
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