[#std-hash-051-operator_call]
= xref:std.adoc[std]::xref:std/hash-051.adoc[hash&lt;folly::indirect&lt;T, Alloc&gt;&gt;]::operator()
:relfileprefix: ../../
:mrdocs:

Hashes a wrapper by its owned value&period;

== Synopsis

Declared in `&lt;folly&sol;Indirect&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size&lowbar;t
operator()(xref:folly/indirect-09.adoc[folly::indirect&lt;T, Alloc&gt;] const& v) const;
----

== Return Value

The hash of the owned value, or 0 if valueless&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *v*
| The wrapper to hash&period;
|===


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