[#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:

Rebinds this reference to the argument at `idx.`

== 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

a reference to `*this`, after the assignment

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

[cols="1,4"]
|===
| Name| Description
| *idx*
| the index of the argument to reference
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#