[#mp_units-operator_minus-09]
= xref:mp_units.adoc[mp_units]::operator‐
:relfileprefix: ../
:mrdocs:

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    std::derived_from<quantity> Q,
    xref:mp_units/RepresentationOf.adoc[RepresentationOf<quantity_spec>] Value>
requires detail::DimensionlessOne<Q::reference> &&
             detail::InvokeResultOf<quantity_spec, std::minus<>, Rep, const Value&>
[[nodiscard]]
constexpr
xref:mp_units/Quantity.adoc[Quantity] auto
operator‐(
    Q const& lhs,
    Value const& rhs);
----


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