[#BloombergLP-bdlc-FlatHashMap-try_emplace-041]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashMap.adoc[FlatHashMap]::try_emplace
:relfileprefix: ../../../
:mrdocs:

Try to emplace an element with `key` using a placement hint.

== Synopsis

Declared in `<bdlc_flathashmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... ARGS>
xref:BloombergLP/bdlc/FlatHashMap/iterator.adoc[FlatHashMap<KEY, VALUE, HASH, EQUAL>::iterator]
try_emplace(
    xref:BloombergLP/bdlc/FlatHashMap/const_iterator.adoc[const_iterator] hint,
    xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<KEY>] key,
    ARGS&&... args);
----

== Description

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<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`.

== Return Value

iterator to the existing or newly inserted element

== Parameters

[cols="1,4"]
|===
| Name| Description
| *hint*
| iterator hint (ignored)
| *key*
| key of the element to emplace (may be moved from)
| *args*
| arguments forwarded to construct the mapped value
|===


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