[#mp_units-utility-fmt_arg_ref-2constructor-0c]
= 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]::fmt&lowbar;arg&lowbar;ref
:relfileprefix: ../../../
:mrdocs:

Default&hyphen;constructs a reference that does not point to any argument (`kind &equals;&equals; fmt&lowbar;arg&lowbar;id&lowbar;kind&colon;&colon;none`)&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
fmt&lowbar;arg&lowbar;ref() = default;
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