bsl::multiset::insert_range

Insert into this multiset the value of each value_type object in the specified range if the key equivalent of that object is not already contained in this map. The (template parameter) type RANGE must meet the requirements the C++20 standard [ranges]providing access to values of a type convertible to value_type, and value_type must be emplace‐constructible from *i into this map, where i is a dereferenceable iterator obtained from range (see {Requirements on KEY}). The behavior is undefined if range overlaps this multiset.