[#mp_units-utility-fmt_arg_ref-value]
= xref:mp_units.adoc[mp&lowbar;units]::xref:mp_units/utility.adoc[utility]::xref:mp_units/utility/fmt_arg_ref.adoc[fmt&lowbar;arg&lowbar;ref]::value
:relfileprefix: ../../../
:mrdocs:

Stores either the referenced argument&apos;s index or (when using fmtlib) its name&period;

== Synopsis

Declared in `&lt;mp&hyphen;units&sol;utility&sol;format&period;h&gt;`

[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&apos;s index, active when `kind &equals;&equals; fmt&lowbar;arg&lowbar;id&lowbar;kind&colon;&colon;index`&period;
|===



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