[#mp_units-utility-detail-operator_3way-04]
= xref:mp_units.adoc[mp_units]::xref:mp_units/utility.adoc[utility]::xref:mp_units/utility/detail.adoc[detail]::operator<=>
:relfileprefix: ../../../
:mrdocs:

Three‐way comparison operator

== Synopsis

Declared in `<mp‐units/utility/constrained.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
constexpr
auto
operator<=>(
    xref:mp_units/utility/constrained.adoc[constrained<T, EP>] const& lhs,
    xref:mp_units/utility/constrained.adoc[constrained<U, EP>] const& rhs);
----

== Return Value

The relative order of the objects

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *lhs*
| The left operand
| *rhs*
| The right operand
|===


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