[#BloombergLP-bdlc-FlatHashMap-try_emplace-0b]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashMap.adoc[FlatHashMap]::try_emplace
:relfileprefix: ../../../
:mrdocs:

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<LOOKUP_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`.

== Synopsis

Declared in `<bdlc_flathashmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class LOOKUP_KEY,
    class... ARGS>
xref:bsl/pair-0b.adoc[bsl::pair<iterator, bool>]
try_emplace(
    LOOKUP_KEY&& key,
    ARGS&&... args)
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
         && BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----


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