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

Insert a newly constructed entry for `key` unless an equivalent key exists.

== Synopses

Declared in `<bdlc_flathashtable.h>`

Insert a newly constructed entry for `key` unless an equivalent key exists.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... ARGS>
xref:bsl/pair-0b.adoc[bsl::pair<FlatHashTable<KEY, ENTRY, ENTRY_UTIL, HASH, EQUAL>::iterator, bool>]
xref:BloombergLP/bdlc/FlatHashTable/try_emplace-08.adoc[try_emplace](
    xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<KEY>] key,
    ARGS&&... args);
----

[.small]#xref:BloombergLP/bdlc/FlatHashTable/try_emplace-08.adoc[_» more..._]#

Insert a newly constructed entry for `key` unless an equivalent key exists.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class... ARGS>
xref:bsl/pair-0b.adoc[bsl::pair<FlatHashTable<KEY, ENTRY, ENTRY_UTIL, HASH, EQUAL>::iterator, bool>]
xref:BloombergLP/bdlc/FlatHashTable/try_emplace-00.adoc[try_emplace](
    KEY const& key,
    ARGS&&... args);
----

[.small]#xref:BloombergLP/bdlc/FlatHashTable/try_emplace-00.adoc[_» more..._]#

Insert a newly constructed entry for `key` unless an equivalent key exists.


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

[.small]#xref:BloombergLP/bdlc/FlatHashTable/try_emplace-0d.adoc[_» more..._]#

== Return Value

pair of iterator to the entry and `true` if inserted

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key used to find or construct the entry
| *args*
| arguments forwarded to construct the mapped value
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#