[#base_uint-02-operator_plus_eq-03]
= xref:base_uint-02.adoc[base&lowbar;uint]::operator&plus;&equals;
:relfileprefix: ../
:mrdocs:

Adds a 64&hyphen;bit value to this big integer in place&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:base_uint-02.adoc[base&lowbar;uint]&
operator&plus;&equals;(uint64&lowbar;t b64);
----

== Return Value

A reference to this object&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b64*
| The value to add&period;
|===


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