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

Return the hash value of the given key&period;

== Synopsis

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

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