[#BloombergLP-bslalg-HashTableImpUtil_ExtractKeyResult]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::HashTableImpUtil_ExtractKeyResult
:relfileprefix: ../../
:mrdocs:

Metafunction that deduces the return type of `KEY_CONFIG::extractKey`.

== Synopsis

Declared in `<bslalg_hashtableimputil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class KEY_CONFIG>
struct HashTableImpUtil_ExtractKeyResult;
----

== Types

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslalg/HashTableImpUtil_ExtractKeyResult/ConstMatch.adoc[`ConstMatch`] 
| Tag type selected when `extractKey` returns `const KeyType&`.
| xref:BloombergLP/bslalg/HashTableImpUtil_ExtractKeyResult/ConversionMatch.adoc[`ConversionMatch`] 
| Tag type selected when `extractKey` returns a converted `KeyType`.
| xref:BloombergLP/bslalg/HashTableImpUtil_ExtractKeyResult/Impl.adoc[`Impl`] 
| Component‐private traits for `extractKey` return‐type deduction.
| xref:BloombergLP/bslalg/HashTableImpUtil_ExtractKeyResult/NonConstMatch.adoc[`NonConstMatch`] 
| Tag type selected when `extractKey` returns `KeyType&`.
|===


== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslalg/HashTableImpUtil_ExtractKeyResult/KeyType.adoc[`KeyType`] 
| Alias for `KEY_CONFIG::KeyType`.
| xref:BloombergLP/bslalg/HashTableImpUtil_ExtractKeyResult/Type.adoc[`Type`] 
| Reference type returned by `extractKey` for `KEY_CONFIG`.
| xref:BloombergLP/bslalg/HashTableImpUtil_ExtractKeyResult/ValueType.adoc[`ValueType`] 
| Alias for `KEY_CONFIG::ValueType`.
|===


== Enums

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslalg/HashTableImpUtil_ExtractKeyResult/_04enum.adoc[`Unnamed enum`] 
| Compile‐time constants used to select the `extractKey` return category.
|===



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