[#base_uint-0d-operator_plus_eq-01a]
= xref:base_uint-0d.adoc[base_uint<256>]::operator+=
:relfileprefix: ../
:mrdocs:

Adds a 64‐bit value to this big integer in place.

== Synopsis

Declared in `<arith_uint256.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:base_uint-02.adoc[base_uint<256>]&
operator+=(uint64_t b64);
----

== Return Value

A reference to this object.

== Parameters

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


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