[#BloombergLP-bdlc-FlatHashSet-contains-03]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashSet.adoc[FlatHashSet]::contains
:relfileprefix: ../../../
:mrdocs:

`contains` overloads

== Synopses

Declared in `<bdlc_flathashset.h>`

Return whether this set contains an element with the specified key.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
xref:BloombergLP/bdlc/FlatHashSet/contains-0a.adoc[contains](KEY const& key) const;
----

[.small]#xref:BloombergLP/bdlc/FlatHashSet/contains-0a.adoc[_» more..._]#

Return whether this set contains an element equivalent to `key`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
bool
xref:BloombergLP/bdlc/FlatHashSet/contains-08.adoc[contains](LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<HASH, LOOKUP_KEY>::value
        &&  BloombergLP::bslmf::IsTransparentPredicate<EQUAL,LOOKUP_KEY>::value;
----

[.small]#xref:BloombergLP/bdlc/FlatHashSet/contains-08.adoc[_» more..._]#

== Return Value

`true` if an element with `key` exists, and `false` otherwise

== Parameters

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


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