[#BloombergLP-bdlc-FlatHashSet-count-06]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashSet.adoc[FlatHashSet]::count
:relfileprefix: ../../../
:mrdocs:

Return the number of elements with the specified `key`&period;

== Synopsis

Declared in `&lt;bdlc&lowbar;flathashset&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::size&lowbar;t
count(KEY const& key) const;
----

== Description

Note that since a flat hash set maintains unique keys, the returned value will be either 0 or 1&period;

== Return Value

1 if `key` is present, and 0 otherwise

== Parameters

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


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