[#std-hash-07-operator_call]
= xref:std.adoc[std]::xref:std/hash-07.adoc[hash&lt;T&gt;]::operator()
:relfileprefix: ../../
:mrdocs:

Hash a strong value by hashing its underlying value&period;

== Synopsis

Declared in `&lt;folly&sol;lang&sol;Strong&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size&lowbar;t
operator()(T const& st) const;
----

== Return Value

The hash of the wrapped underlying value&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *st*
| The strong value to hash&period;
|===


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