[#std-hash-07-operator_call]
= xref:std.adoc[std]::xref:std/hash-07.adoc[hash<T>]::operator()
:relfileprefix: ../../
:mrdocs:

Hash a strong value by hashing its underlying value.

== Synopsis

Declared in `<folly/lang/Strong.h>`

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

== Return Value

The hash of the wrapped underlying value.

== Parameters

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


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