[#std-hash-05b]
= xref:std.adoc[std]::hash<xref:folly/enable_std_hash_helper.adoc[folly::enable_std_hash_helper<folly::Optional<T>, remove_const_t<T>>]>
:relfileprefix: ../
:mrdocs:

Hash specialization enabling folly::Optional in unordered containers.

== Synopsis

Declared in `<folly/Optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class T>
struct hash<xref:folly/enable_std_hash_helper.adoc[folly::enable_std_hash_helper<folly::Optional<T>, remove_const_t<T>>]>;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:std/hash-05b/operator_call.adoc[`operator()`] 
| Computes the hash of an Optional.
|===



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