[#BloombergLP-bdlc-FlatHashSet-contains-0a]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashSet.adoc[FlatHashSet]::contains
:relfileprefix: ../../../
:mrdocs:

Return whether this set contains an element with the specified key.

== Synopsis

Declared in `<bdlc_flathashset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
contains(KEY const& key) const;
----

== Return Value

`true` if an element with `key` exists, and `false` otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| key to look up
|===


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