[#std-hash-026d6]
= xref:std.adoc[std]::hash<xref:folly/unique_hash_key.adoc[folly::unique_hash_key<Size>]>
:relfileprefix: ../
:mrdocs:

std::hash specialization for folly::unique_hash_key.

== Synopsis

Declared in `<folly/hash/UniqueHashKey.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<size_t Size>
struct hash<xref:folly/unique_hash_key.adoc[folly::unique_hash_key<Size>]>;
----

== Type Aliases

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


== Member Functions

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



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