[#std-hash-055-operator_call]
= xref:std.adoc[std]::xref:std/hash-055.adoc[hash&lt;std::pair&lt;T1, T2&gt;&gt;]::operator()
:relfileprefix: ../../
:mrdocs:

Hash the pair by combining the hashes of its elements&period;

== Synopsis

Declared in `&lt;folly&sol;hash&sol;Hash&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size&lowbar;t
operator()(std::pair&lt;T1, T2&gt; const& x) const;
----

== Return Value

The combined hash

== Parameters

[cols="1,4"]
|===
| Name| Description
| *x*
| Pair to hash
|===


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