[#mp_units-operator_3way-0c3]
= xref:mp_units.adoc[mp_units]::operator<=>
:relfileprefix: ../
:mrdocs:

Three‐way comparison operator

== 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> && std::three_way_comparable_with<rep, Value>
[[nodiscard]]
constexpr
auto
operator<=>(
    Q const& lhs,
    Value const& rhs);
----

== Return Value

The relative order of the objects

== Parameters

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


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