[#nlohmann-basic_json-0c-operator_plus_eq-05]
= xref:nlohmann.adoc[nlohmann]::xref:nlohmann/basic_json-0c.adoc[basic_json]::operator+=
:relfileprefix: ../../
:mrdocs:

add an object to an object

== Synopsis

Declared in `<nlohmann/json.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:nlohmann/basic_json-0c/reference.adoc[reference]
operator+=(object_t::value_type const& val);
----

== Return Value

reference to `*this`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *val*
| key‐value pair to insert into the object
|===


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