[#std-hash-026d6]
= xref:std.adoc[std]::hash&lt;xref:folly/unique_hash_key.adoc[folly::unique&lowbar;hash&lowbar;key&lt;Size&gt;]&gt;
:relfileprefix: ../
:mrdocs:

std&colon;&colon;hash specialization for folly&colon;&colon;unique&lowbar;hash&lowbar;key&period;

== Synopsis

Declared in `&lt;folly&sol;hash&sol;UniqueHashKey&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;size&lowbar;t Size&gt;
struct hash&lt;xref:folly/unique_hash_key.adoc[folly::unique&lowbar;hash&lowbar;key&lt;Size&gt;]&gt;;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:std/hash-026d6/folly_is_avalanching.adoc[`folly&lowbar;is&lowbar;avalanching`] 
| Marks this hash as producing well&hyphen;distributed (avalanching) values&period;
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:std/hash-026d6/operator_call.adoc[`operator()`] 
| Return the hash value of the given key&period;
|===



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