[#nlohmann-basic_json-0e-operator_plus_eq-0fb]
= xref:nlohmann.adoc[nlohmann]::xref:nlohmann/basic_json-0e.adoc[basic_json<>]::operator+=
:relfileprefix: ../../
:mrdocs:

Addition assignment operator

== Synopsis

Declared in `<nlohmann/json.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:nlohmann/basic_json-0e/reference.adoc[reference]
operator+=(xref:nlohmann/basic_json-0e/initializer_list_t.adoc[initializer_list_t] init);
----

== Return Value

the type of an element reference

== Parameters

[cols=2]
|===
| Name
| Description
| *init*
| The right operand
|===


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