[#mp_units-operator_minus-01]
= xref:mp_units.adoc[mp&lowbar;units]::operator&hyphen;
:relfileprefix: ../
:mrdocs:

== Synopsis

Declared in `&lt;mp&hyphen;units&sol;framework&sol;quantity&lowbar;point&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    std::derived&lowbar;from&lt;quantity&lowbar;point&gt; QP,
    xref:mp_units/PointOrigin.adoc[PointOrigin] PO2&gt;
requires QuantityPointOf&lt;quantity&lowbar;point, PO2&lcub;&rcub;&gt; &amp;&amp;
             ReferenceOf&lt;MP&lowbar;UNITS&lowbar;NONCONST&lowbar;TYPE(reference), PO2&colon;&colon;&lowbar;quantity&lowbar;spec&lowbar;&gt;
&lsqb;&lsqb;nodiscard&rsqb;&rsqb;
constexpr
xref:mp_units/Quantity.adoc[Quantity] auto
operator&hyphen;(
    QP const& qp,
    PO2 po);
----


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