[#PresaltedSipHasher-operator_call-0d]
= xref:PresaltedSipHasher.adoc[PresaltedSipHasher]::operator()
:relfileprefix: ../
:mrdocs:

Equivalent to CSipHasher(k0, k1).Write(val).Write(extra).Finalize(), with `extra` encoded as 4 little‐endian bytes.

== Synopsis

Declared in `<crypto/siphash.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
uint64_t
operator()(
    xref:uint256.adoc[uint256] const& val,
    uint32_t extra) const noexcept;
----

== Return Value

The resulting 64‐bit hash.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *val*
| The 256‐bit value to hash.
| *extra*
| The extra 32‐bit word to hash after val.
|===


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