[#BloombergLP-bslstl-UnorderedMapKeyConfiguration-0b-extractKey]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/UnorderedMapKeyConfiguration-0b.adoc[UnorderedMapKeyConfiguration<basic_string<char> const, pair<basic_string<char> const, Json>>]::extractKey
:relfileprefix: ../../../
:mrdocs:

Return the member `first` of the specified object `obj`. `obj.first` must be of type `VALUE_TYPE::first_type`, which is the `key` portion of `obj`.

== Synopsis

Declared in `<bslstl_unorderedmapkeyconfiguration.h>`

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


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