22 Containers library [containers]

The header <map> defines the class templates map and multimap; the header <set> defines the class templates set and multiset.

The following exposition-only alias templates may appear in deduction guides for associative containers: template<class InputIterator> using iter-value-type = typename iterator_traits<InputIterator>::value_type; // exposition only template<class InputIterator> using iter-key-type = remove_const_t< typename iterator_traits<InputIterator>::value_type::first_type>; // exposition only template<class InputIterator> using iter-mapped-type = typename iterator_traits<InputIterator>::value_type::second_type; // exposition only template<class InputIterator> using iter-to-alloc-type = pair< add_const_t<typename iterator_traits<InputIterator>::value_type::first_type>, typename iterator_traits<InputIterator>::value_type::second_type>; // exposition only