Defined in header <iterator> template< class Container >
class back_insert_iterator : public std::iterator< std::output_iterator_tag,
void, void, void, void > (until C++17) template< class Container >
class back_insert_iterator; (since C++17)
std::back_insert_iterator is an OutputIterator that appends to a container for which it was constructed. The container's push_back() member function is called w