[#BloombergLP-bslstl-UnorderedMapKeyConfiguration-0b-extractKey]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/UnorderedMapKeyConfiguration-0b.adoc[UnorderedMapKeyConfiguration&lt;basic&lowbar;string&lt;char&gt; const, pair&lt;basic&lowbar;string&lt;char&gt; const, Json&gt;&gt;]::extractKey
:relfileprefix: ../../../
:mrdocs:

Return the member `first` of the specified object `obj`&period; `obj&period;first` must be of type `VALUE&lowbar;TYPE&colon;&colon;first&lowbar;type`, which is the `key` portion of `obj`&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;unorderedmapkeyconfiguration&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
xref:BloombergLP/bslstl/UnorderedMapKeyConfiguration-0b/KeyType.adoc[KeyType] const&
extractKey(xref:bsl/pair-0b.adoc[pair&lt;basic&lowbar;string&lt;char&gt; const, Json&gt;] const& obj);
----


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