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

Compute the hash of a block hash from its first 8 bytes&period;

== Synopsis

Declared in `&lt;util&sol;hasher&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
size&lowbar;t
operator()(xref:uint256.adoc[uint256] const& hash) const;
----

== Return Value

The little&hyphen;endian 64&hyphen;bit value read from the start of the hash&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *hash*
| The block hash to hash&period;
|===


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