[#bsl-unordered_multimap-0b0-contains-0e]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_multimap-0b0.adoc[unordered_multimap]::contains
:relfileprefix: ../../
:mrdocs:

Return `true` if this container has an element with key equivalent to `key`.

== Synopses

Declared in `<bslstl_unorderedmultimap.h>`

Return `true` if this container has an element with key equivalent to `key`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
xref:bsl/unordered_multimap-0b0/contains-03.adoc[contains](xref:bsl/unordered_multimap-0b0/key_type.adoc[key_type] const& key) const;
----

[.small]#xref:bsl/unordered_multimap-0b0/contains-03.adoc[_» more..._]#

Return `true` if this container has an element with key equivalent to `key`.


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
bool
xref:bsl/unordered_multimap-0b0/contains-06.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_multimap-0b0/contains-06.adoc[_» more..._]#

== Return Value

* `true` if `key` is present, and `false` otherwise
* `true` if present, otherwise `false`

== Parameters

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


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