[#std-hash-055-operator_call]
= xref:std.adoc[std]::xref:std/hash-055.adoc[hash<std::pair<T1, T2>>]::operator()
:relfileprefix: ../../
:mrdocs:

Hash the pair by combining the hashes of its elements.

== Synopsis

Declared in `<folly/hash/Hash.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size_t
operator()(std::pair<T1, T2> const& x) const;
----

== Return Value

The combined hash

== Parameters

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


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