bsl::unordered_multiset::emplace

Insert into this unordered multiset a newly created value_type object, constructed by forwarding get_allocator() (if required) and the specified (variable number of) args to the corresponding constructor of value_type. Return an iterator referring to the newly created and inserted object in this unordered multiset whose value is equivalent to that of an object constructed from args. This method requires that the (template parameter) type KEY be emplace‐constructible into this unordered multiset from args (see {Requirements on KEY}).