[#mp_units-utility-fmt_arg_ref-val]
= 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]::val
:relfileprefix: ../../../
:mrdocs:

The referenced argument&apos;s index or (when using fmtlib) name, per xref:mp_units/utility/fmt_arg_ref/kind.adoc[`kind`]&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:mp_units/utility/fmt_arg_ref/value.adoc[value] val = &lcub;&rcub;;
----


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