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

Return the hash value of the given key.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
operator()(xref:folly/unique_hash_key.adoc[folly::unique_hash_key<Size>] const& key) const noexcept;
----

== Return Value

The stored hash value of the key

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| Key to hash
|===


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