[#mp_units-delta_-operator_call]
= xref:mp_units.adoc[mp&lowbar;units]::xref:mp_units/delta_.adoc[delta&lowbar;]::operator()
:relfileprefix: ../../
:mrdocs:

Function call operator

== Synopsis

Declared in `&lt;mp&hyphen;units&sol;framework&sol;construction&lowbar;helpers&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    typename FwdRep,
    xref:mp_units/RepresentationOf.adoc[RepresentationOf&lt;get&lowbar;quantity&lowbar;spec(R&lcub;&rcub;)&gt;] Rep = std::remove&lowbar;cvref&lowbar;t&lt;FwdRep&gt;&gt;
&lsqb;&lsqb;nodiscard&rsqb;&rsqb;
constexpr
xref:mp_units/quantity-01.adoc[quantity&lt;R&lcub;&rcub;, Rep&gt;]
operator()(FwdRep&& lhs) const;
----

== Return Value

A quantity

== Parameters

[cols=2]
|===
| Name
| Description
| *lhs*
| The right operand
|===


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