[#bsl-unordered_set-02a-contains-0b]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_set-02a.adoc[unordered_set<ManagedAttribute, AttributeHash>]::contains
:relfileprefix: ../../
:mrdocs:

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

== Synopses

Declared in `<bslstl_unorderedset.h>`

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
xref:bsl/unordered_set-02a/contains-0a.adoc[contains](xref:bsl/unordered_set-02a/key_type.adoc[key_type] const& key) const;
----

[.small]#xref:bsl/unordered_set-02a/contains-0a.adoc[_» more..._]#

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
bool
xref:bsl/unordered_set-02a/contains-09.adoc[contains](LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value &&
            BloombergLP::bslmf::IsTransparentPredicate<EQUAL,
                                                       LOOKUP_KEY>::value;
----

[.small]#xref:bsl/unordered_set-02a/contains-09.adoc[_» more..._]#


[.small]#Created with https://www.mrdocs.com[MrDocs]#