[#bsl-unordered_set-09-count-06]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_set-09.adoc[unordered_set<Attribute, AttributeHash>]::count
:relfileprefix: ../../
:mrdocs:

Return the number of `value_type` objects within this unordered set that are equivalent to the specified `key`. Note that since an unordered set maintains unique keys, the returned value will be either 0 or 1.

== Synopsis

Declared in `<bslstl_unorderedset.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_set-09/size_type.adoc[size_type]
count(xref:bsl/unordered_set-09/key_type.adoc[key_type] const& key) const;
----


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