bsl::unordered_map::insert

Create a value_type object for each iterator in the range starting at the specified first iterator and ending immediately before the specified last iterator, by converting from the object referred to by each iterator. Insert into this unordered map each such object whose key is not already contained. The (template parameter) type INPUT_ITERATOR shall meet the requirements of an input iterator defined in the C++11 standard [24.2.3]providing access to values of a type convertible to value_type. The behavior is undefined unless first and last refer to a sequence of valid values where first is at a position at or before last. Note that this method requires that the (template parameter) types KEY and VALUE both be copy‐constructible (see {Requirements on value_type}).