[#std-hash-051]
= xref:std.adoc[std]::hash<xref:folly/indirect-09.adoc[folly::indirect<T, Alloc>]>
:relfileprefix: ../
:mrdocs:

Hash specialization for `folly::indirect`.

== Synopsis

Declared in `<folly/Indirect.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename T,
    typename Alloc>
requires requires(const T& t) { std::hash<T>{}(t); }
struct hash<xref:folly/indirect-09.adoc[folly::indirect<T, Alloc>]>;
----

== Description

Enabled only when `hash<T>` is enabled. Not guaranteed `noexcept` per spec.

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:std/hash-051/operator_call.adoc[`operator()`] 
| Hashes a wrapper by its owned value.
|===



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