[#BloombergLP-bslstl-UnorderedMapKeyConfiguration-extractKey]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/UnorderedMapKeyConfiguration.adoc[UnorderedMapKeyConfiguration]::extractKey
:relfileprefix: ../../../
:mrdocs:

Return the member `first` of the specified object `obj`.

== Synopsis

Declared in `<bslstl_unorderedmapkeyconfiguration.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
KEY const&
extractKey(VALUE_TYPE const& obj);
----

== Description

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

== Return Value

const reference to the key (`first`) member of `obj`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *obj*
| value object from which to extract the key
|===


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