[#bsl-map-0a7-contains-06]
= xref:bsl.adoc[bsl]::xref:bsl/map-0a7.adoc[map]::contains
:relfileprefix: ../../
:mrdocs:

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

== Synopses

Declared in `<bslstl_map.h>`

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
xref:bsl/map-0a7/contains-01.adoc[contains](xref:bsl/map-0a7/key_type.adoc[key_type] const& key) const;
----

[.small]#xref:bsl/map-0a7/contains-01.adoc[_» more..._]#

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class LOOKUP_KEY>
bool
xref:bsl/map-0a7/contains-00.adoc[contains](LOOKUP_KEY const& key) const
requires BloombergLP::bslmf::IsTransparentPredicate<COMPARATOR,
                                                   LOOKUP_KEY>::value;
----

[.small]#xref:bsl/map-0a7/contains-00.adoc[_» more..._]#

== Return Value

`true` if an equivalent key is present

== Parameters

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


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