[#arith_uint256-2constructor-03]
= xref:arith_uint256.adoc[arith&lowbar;uint256]::arith&lowbar;uint256
:relfileprefix: ../
:mrdocs:

Constructs a 256&hyphen;bit integer from a 64&hyphen;bit unsigned value&period;

== Synopsis

Declared in `&lt;arith&lowbar;uint256&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
arith&lowbar;uint256(uint64&lowbar;t b);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| The value to store in the low 64 bits&period;
|===


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