[#mp_units-get_common_unit-09]
= xref:mp_units.adoc[mp_units]::get_common_unit
:relfileprefix: ../
:mrdocs:

Computes the common unit of two `common_unit` compounds by merging their unit lists

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    xref:mp_units/Unit.adoc[Unit] Front,
    xref:mp_units/Unit.adoc[Unit]... Rest,
    xref:mp_units/Unit.adoc[Unit]... Us>
requires (detail::UnitConvertibleTo<common_unit<Front, Rest...>, common_unit<Us...>{}>)
[[nodiscard]]
consteval
xref:mp_units/Unit.adoc[Unit] auto
get_common_unit(
    xref:mp_units/common_unit.adoc[common_unit<Front, Rest...>] cu1,
    xref:mp_units/common_unit.adoc[common_unit<Us...>] cu2);
----

== Return Value

the common unit obtained by merging the unit lists of `cu1` and `cu2`

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

[cols="1,4"]
|===
| Name| Description
| *cu1*
| first `common_unit` compound
| *cu2*
| second `common_unit` compound
|===


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