BloombergLP::bdlc::FlatHashMap::try_emplace

Synopsis

Declared in <bdlc_flathashmap.h>

template<class... ARGS>
bsl::pair<FlatHashMap<KEY, VALUE, HASH, EQUAL>::iterator, bool>
try_emplace(
    BloombergLP::bslmf::MovableRef<KEY> key,
    ARGS&&... args);

Description

If a key equivalent to the specified key already exists in this map, return a pair containing an iterator referring to the existing item and false. Otherwise, insert into this map a newly-created value_type object, constructed from std::forward<KEY>(key) and the specified args, and return a pair containing an iterator referring to the newly-created entry, and true. 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.

Return Value

pair of iterator to the element and whether insertion occurred

Parameters

Name	Description
key	key of the element to emplace (may be moved from)
args	arguments forwarded to construct the mapped value