[#bsl-unordered_map-02b-contains-00]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-02b.adoc[unordered_map]::contains
:relfileprefix: ../../
:mrdocs:

Return whether this unordered map contains the specified `key`.

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
contains(xref:bsl/unordered_map-02b/key_type.adoc[key_type] const& key) const;
----

== Description

Return `true` if this unordered map contains an element whose key is equivalent to the specified `key`.

== Return Value

`true` if present, otherwise `false`

== Parameters

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


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