[#base_uint-0d-operator_assign-0a]
= xref:base_uint-0d.adoc[base_uint<256>]::operator=
:relfileprefix: ../
:mrdocs:

Assigns a 64‐bit unsigned value to this big integer.

== Synopsis

Declared in `<arith_uint256.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:base_uint-02.adoc[base_uint<256>]&
operator=(uint64_t b);
----

== Return Value

A reference to this object.

== Parameters

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


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