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

This `struct` provides a namespace for key‐configuration utilities used by `bsl::unordered_map` to extract keys from stored value objects.

== Synopsis

Declared in `<bslstl_unorderedmapkeyconfiguration.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class KEY,
    class VALUE_TYPE>
struct UnorderedMapKeyConfiguration;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/UnorderedMapKeyConfiguration/KeyType.adoc[`KeyType`] 
| This `typedef` is an alias to the (template parameter) `KEY`.
| xref:BloombergLP/bslstl/UnorderedMapKeyConfiguration/ValueType.adoc[`ValueType`] 
| This `typedef` is an alias to the (template parameter) `VALUE_TYPE`.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/UnorderedMapKeyConfiguration/extractKey.adoc[`extractKey`] 
| Return the member `first` of the specified object `obj`.
|===



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