std::insert_iterator<Container>::insert_iterator
From cppreference.com
                    
                                        
                    < cpp | iterator | insert iterator
                    
                                                            
                    
| insert_iterator( Container& c, typename Container::iterator i ); | (until C++20) | |
| constexpr insert_iterator( Container& c, ranges::iterator_t<Container> i ); | (since C++20) | |
Initializes the underlying pointer to the container to std::addressof(c) and the underlying iterator to i.
Parameters
| c | - | container to initialize the inserter with | 
| i | - | iterator to initialize the inserter with | 
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior | 
|---|---|---|---|
| P2325R3 | C++20 | default constructor was provided as C++20 iterators must be default_initializable | removed along with the requirement |