[#bsl-unordered_map-0bf-contains-0e]
= xref:bsl.adoc[bsl]::xref:bsl/unordered_map-0bf.adoc[unordered_map<basic_string<char>, Json, TransparentHash, TransparentEqualTo>]::contains
:relfileprefix: ../../
:mrdocs:

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

== Synopsis

Declared in `<bslstl_unorderedmap.h>`

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


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