Emplace a value for a transparent key if missing; otherwise return existing.
Declared in <bslstl_hashtable.h>
template<
class LOOKUP_KEY,
class... ARGS>
bslalg::BidirectionalLink*
tryEmplace(
bool* isInsertedFlag,
bslalg::BidirectionalLink* hint,
LOOKUP_KEY&& key,
ARGS&&... args)
requires BloombergLP::bslmf::IsTransparentPredicate<HASHER, LOOKUP_KEY>::value
&& BloombergLP::bslmf::IsTransparentPredicate<COMPARATOR,LOOKUP_KEY>::value;If a key equivalent to the specified key already exists in this hash-table, load false into the specified isInsertedFlag and return a pointer to the existing entry. Otherwise, insert into this hash-table a newly-created value_type object, constructed from key and the specified args, load true into isInsertedFlag and return a pointer to the newly created entry. Use the optionally specified hint as a starting place for the search for the existing key.
pointer to the existing or newly created entry
| Name | Description |
|---|---|
| isInsertedFlag | set to true if a new entry was inserted |
| hint | optional starting node for the key search |
| key | transparent key used to find or insert an entry |
| args | arguments used to construct the mapped value |