[#arith_uint256-2constructor-03]
= xref:arith_uint256.adoc[arith_uint256]::arith_uint256
:relfileprefix: ../
:mrdocs:

Constructs a 256‐bit integer from a 64‐bit unsigned value.

== Synopsis

Declared in `<arith_uint256.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
arith_uint256(uint64_t b);
----

== Parameters

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


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