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

Stores either the referenced argument's index or (when using fmtlib) its name.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
union value;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/utility/fmt_arg_ref/value/2constructor-0d.adoc[`value`]         [.small]#[constructor]#
| Constructors
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/utility/fmt_arg_ref/value/index.adoc[`index`] [.small]#[variant member]#
| The referenced argument's index, active when `kind == fmt_arg_id_kind::index`.
|===



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