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

std::hash specialization for std::pair.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename T1,
    typename T2>
struct hash<std::pair<T1, T2>>;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:std/hash-055/folly_is_avalanching.adoc[`folly_is_avalanching`] 
| Marks this hash as producing well‐distributed (avalanching) values.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:std/hash-055/operator_call.adoc[`operator()`] 
| Hash the pair by combining the hashes of its elements.
|===



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