[#mp_units-operator_minus-0c]
= xref:mp_units.adoc[mp_units]::operator‐
:relfileprefix: ../
:mrdocs:

Subtraction operators

== Synopses

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


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    xref:mp_units/PointOrigin.adoc[PointOrigin] PO1,
    std::derived_from<quantity_point> QP>
requires QuantityPointOf<quantity_point, PO1{}> &&
             ReferenceOf<MP_UNITS_NONCONST_TYPE(reference), PO1::_quantity_spec_>
[[nodiscard]]
constexpr
xref:mp_units/Quantity.adoc[Quantity] auto
xref:mp_units/operator_minus-0e.adoc[operator‐](
    PO1 po,
    QP const& qp);
----

[.small]#xref:mp_units/operator_minus-0e.adoc[_» more..._]#


[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
xref:mp_units/operator_minus-09.adoc[operator‐](
    Q const& lhs,
    Value const& rhs);
----

[.small]#xref:mp_units/operator_minus-09.adoc[_» more..._]#


[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
xref:mp_units/operator_minus-06.adoc[operator‐](
    QP const& lhs,
    QP2 const& rhs)
requires requires { lhs.quantity_ref_from(point_origin) ‐ rhs.quantity_ref_from(QP2::point_origin); };
----

[.small]#xref:mp_units/operator_minus-06.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    std::derived_from<quantity_point> QP,
    xref:mp_units/PointOrigin.adoc[PointOrigin] PO2>
requires QuantityPointOf<quantity_point, PO2{}> &&
             ReferenceOf<MP_UNITS_NONCONST_TYPE(reference), PO2::_quantity_spec_>
[[nodiscard]]
constexpr
xref:mp_units/Quantity.adoc[Quantity] auto
xref:mp_units/operator_minus-01.adoc[operator‐](
    QP const& qp,
    PO2 po);
----

[.small]#xref:mp_units/operator_minus-01.adoc[_» more..._]#


[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
xref:mp_units/operator_minus-0b.adoc[operator‐](
    Value const& lhs,
    Q const& rhs);
----

[.small]#xref:mp_units/operator_minus-0b.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    std::derived_from<quantity> Q,
    auto R2,
    typename Rep2>
requires detail::CommonlyInvocableQuantities<std::minus<>, quantity, quantity<R2, Rep2>>
[[nodiscard]]
constexpr
xref:mp_units/Quantity.adoc[Quantity] auto
xref:mp_units/operator_minus-0d.adoc[operator‐](
    Q const& lhs,
    xref:mp_units/quantity-01.adoc[quantity<R2, Rep2>] const& rhs);
----

[.small]#xref:mp_units/operator_minus-0d.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    std::derived_from<quantity_point> QP,
    xref:mp_units/ReferenceOf.adoc[ReferenceOf<PO._quantity_spec_>] auto R2,
    typename Rep2>
[[nodiscard]]
constexpr
xref:mp_units/QuantityPoint.adoc[QuantityPoint] auto
xref:mp_units/operator_minus-05.adoc[operator‐](
    QP const& qp,
    xref:mp_units/quantity-01.adoc[quantity<R2, Rep2>] const& q)
requires requires { qp.quantity_ref_from(PO) ‐ q; };
----

[.small]#xref:mp_units/operator_minus-05.adoc[_» more..._]#


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