[#bsl-unordered_map-0bf-count-00]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-0bf.adoc[unordered_map<basic_string<char>, Json, TransparentHash, TransparentEqualTo>]::count
:relfileprefix: ../../
:mrdocs:

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

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/unordered_map-0bf/size_type.adoc[size_type]
count(xref:bsl/unordered_map-0bf/key_type.adoc[key_type] const& key) const;
----


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