If a key equivalent to the specified key already exists in this map return an iterator referring to the existing item. Otherwise, insert into this map a newly-created value_type object, constructed from std::forward<LOOKUP_KEY>(key) and the specified args, and return an iterator referring to the newly-created entry. This method requires that the (template parameter) types KEY and VALUE are emplace-constructible from key and args respectively. For C++03, VALUE must also be copy-constructible.
Declared in <bdlc_flathashmap.h>
template<
class LOOKUP_KEY,
class... ARGS>
iterator
try_emplace(
const_iterator,
LOOKUP_KEY&& key,
ARGS&&... args)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
&& BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;