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

Extract one of eight 32‐bit sub‐hashes from a 256‐bit key.

== Synopsis

Declared in `<util/hasher.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<uint8_t hash_select>
uint32_t
operator()(xref:uint256.adoc[uint256] const& key) const;
----

== Return Value

The selected 32‐bit word of the key.

== Template Parameters

[cols="1,4"]
|===
| Name| Description
| *hash_select*
| Which 32‐bit word to read, in the range 0 to 7.
|===

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key*
| The 256‐bit key to read the sub‐hash from.
|===


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