[#mp_units-utility-fmt_arg_ref-operator_assign]
= xref:mp_units.adoc[mp_units]::xref:mp_units/utility.adoc[utility]::xref:mp_units/utility/fmt_arg_ref.adoc[fmt_arg_ref]::operator=
:relfileprefix: ../../../
:mrdocs:

Assignment operator

== Synopsis

Declared in `<mp‐units/utility/format.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
constexpr
xref:mp_units/utility/fmt_arg_ref.adoc[fmt_arg_ref]&
operator=(int idx);
----

== Return Value

Reference to the current object

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *idx*
| The value to assign from
|===


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