[#BloombergLP-bslstl-HashTable-insertIfMissing-02]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/HashTable.adoc[HashTable]::insertIfMissing
:relfileprefix: ../../../
:mrdocs:

Insert a default‐mapped value for a movable `key` if missing.

== Synopsis

Declared in `<bslstl_hashtable.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bslalg/BidirectionalLink.adoc[bslalg::BidirectionalLink]*
insertIfMissing(xref:BloombergLP/bslmf/MovableRef.adoc[bslmf::MovableRef<NonConstKeyType>] key);
----

== Return Value

address of the element whose key is equivalent to `key`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| movable key used to find or insert an element
|===


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