[#absl-HashOf]
= xref:absl.adoc[absl]::HashOf
:relfileprefix: ../
:mrdocs:

Generate a hash from the values of its arguments.

== Synopsis

Declared in `<absl/hash/hash.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    int& ExplicitArgumentBarrier...,
    typename... Types>
size_t
HashOf(Types const&... values);
----

== Description

absl::HashOf() is a helper that generates a hash from the values of its arguments. It dispatches to absl::Hash directly, as follows: * HashOf(t) == absl::Hash<T>{}(t) * HashOf(a, b, c) == HashOf(std::make_tuple(a, b, c))

HashOf(a1, a2, ...) == HashOf(b1, b2, ...) is guaranteed when * The argument lists have pairwise identical C++ types * a1 == b1 && a2 == b2 && ...

The requirement that the arguments match in both type and value is critical. It means that `a == b` does not necessarily imply `HashOf(a) == HashOf(b)` if `a` and `b` have different types. For example, `HashOf(2) != HashOf(2.0)`.

== Return Value

The combined hash of the arguments.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *values*
| The values to hash together.
|===


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