BloombergLP::bslstl::HashTable<UnorderedMapKeyConfiguration<basic_string<char> const, pair<basic_string<char> const, Json>>, TransparentHash, TransparentEqualTo, allocator<pair<basic_string<char> const, Json>>>::insertIfMissing

Insert into this hash‐table a newly‐created ValueType object, constructed by forwarding the specified key and a default‐constructed object of the type ValueType::second_type, to the corresponding constructor of ValueType, if key does not already exist in this hash‐table. Return the address of the (possibly newly created and inserted) element in this hash‐table whose key is equivalent to key. If this hash‐table contains more than one element with the supplied key, return the first such element (from the contiguous sequence of elements having a matching key). Additional buckets are allocated, as needed, to preserve the invariant loadFactor <= maxLoadFactor. If this function tries to allocate a number of buckets larger than can be represented by this hash table's SizeType, a std::length_error exception is thrown. This method requires that the ValueType defined in the (template parameter) type KEY_CONFIG be emplace‐constructible into this hash‐table from a pair of arguments representing the key and value, respectively (see {Requirements on KEY_CONFIG});