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std::multimap::insert(3) C++ Standard Libary std::multimap::insert(3) NAME std::multimap::insert - std::multimap::insert Synopsis iterator insert( const value_type& value ); (1) iterator insert( value_type&& value ); (2) (since C++17) template< class P > (3) (since C++11) iterator insert( P&& value ); iterator insert( iterator pos, const value_type& (until C++11) value ); iterator insert( const_iterator pos, const (since C++11) value_type& value ); iterator insert( const_iterator pos, value_type&& (5) (since C++17) value ); template< class P > (6) (since C++11) iterator insert( const_iterator pos, P&& value ); (4) template< class InputIt > (7) 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 pos, node_type&& nh (10) (since C++17) ); Inserts element(s) into the container. 1-3) Inserts value. If the container has elements with equivalent key, inserts at the upper bound of that range. 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 in the position as close as possible to the posi- tion just prior to pos. 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). 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. If a range containing elements with keys equivalent to nh.key() ex- ists in the container, the element is inserted at the end of that range. The be- havior is undefined if nh is not empty and get_allocator() != nh.get_alloca- tor(). 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(). 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_alloca- tor(). No iterators or references are 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 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 1-6) 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 by any operation, the insertion has no effect. 7,8) No exception safety guarantee. 9,10) If an exception is thrown by any operation, the insertion has no effect. Complexity 1-3) O(log(size())) 4-6) Amortized constant if the insertion happens in the position just before pos, O(log(size())) otherwise. 7,8) O(Nlog(size() + N)), where N is the number of elements to in- sert. 9) O(log(size())) 10) Amortized constant if the insertion happens in the position just before pos, O(log(size())) otherwise. Example // Run this code #include <functional> #include <iostream> #include <map> #include <string> #include <string_view> #include <utility> template<class M> void print(const std::string_view rem, const M& mmap) { std::cout << rem << ' '; for (const auto& e : mmap) std::cout << '{' << e.first << ',' << e.second << "} "; std::cout << '\n'; } int main() { // list-initialize std::multimap<int, std::string, std::greater<int>> mmap {{2, "foo"}, {2, "bar"}, {3, "baz"}, {1, "abc"}, {5, "def"}}; print("#1", mmap); // insert using value_type mmap.insert(decltype(mmap)::value_type(5, "pqr")); print("#2", mmap); // insert using pair mmap.insert(std::pair{6, "uvw"}); print("#3", mmap); mmap.insert({7, "xyz"}); print("#4", mmap); // insert using initializer_list mmap.insert({{5, "one"}, {5, "two"}}); print("#5", mmap); // insert using a pair of iterators mmap.clear(); const auto il = {std::pair{1, ""}, {2, ""}, {2, ""}, {3, ""}}; mmap.insert(il.begin(), il.end()); print("#6", mmap); } Output: #1 {5,def} {3,baz} {2,foo} {2,bar} {1,abc} #2 {5,def} {5,pqr} {3,baz} {2,foo} {2,bar} {1,abc} #3 {6,uvw} {5,def} {5,pqr} {3,baz} {2,foo} {2,bar} {1,abc} #4 {7,xyz} {6,uvw} {5,def} {5,pqr} {3,baz} {2,foo} {2,bar} {1,abc} #5 {7,xyz} {6,uvw} {5,def} {5,pqr} {5,one} {5,two} {3,baz} {2,foo} {2,bar} {1,abc} #6 {3,} {2,} {2,} {1,} 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 the inser- tion is required pos was just a hint, it could be to LWG 233 C++98 totally ignored be as close as possible to the position just prior to pos the complexity of overload (5) was removed the linear LWG 264 C++98 required to be linear if require- ment the range [first, last) is sorted in this special case according to Compare LWG 371 C++98 the order of equivalent elements required to be preserved was not guaranteed to be preserved LWG 2005 C++11 overloads (3,6) were poorly described improved the description 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 2024.06.10 std::multimap::insert(3)
NAME | Synopsis | Parameters | Type requirements | Return value | Exceptions | Complexity | Example | Output: | See also
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