[#mp_units-operator_minus-06]
= xref:mp_units.adoc[mp_units]::operator‐
:relfileprefix: ../
:mrdocs:

== Synopsis

Declared in `<mp‐units/framework/quantity_point.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    std::derived_from<quantity_point> QP,
    xref:mp_units/QuantityPointOf.adoc[QuantityPointOf<absolute_point_origin>] QP2>
[[nodiscard]]
constexpr
xref:mp_units/Quantity.adoc[Quantity] auto
operator‐(
    QP const& lhs,
    QP2 const& rhs)
requires requires { lhs.quantity_ref_from(point_origin) ‐ rhs.quantity_ref_from(QP2::point_origin); };
----


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