[#mp_units-operator_star-004]
= xref:mp_units.adoc[mp_units]::operator*
:relfileprefix: ../
:mrdocs:

`scaled_unit` specializations have priority in this operation. This means that the library framework prevents passing it as an element to the `derived_unit`. In such case only the reference unit is passed to the derived unit and the magnitude remains outside forming another scaled unit as a result of the operation.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    xref:mp_units/Dimension.adoc[Dimension] Lhs,
    xref:mp_units/Dimension.adoc[Dimension] Rhs>
[[nodiscard]]
consteval
xref:mp_units/Dimension.adoc[Dimension] auto
operator*(
    Lhs lhs,
    Rhs rhs);
----

[NOTE]
====
This function is a https://en.cppreference.com/w/cpp/language/friend[hidden friend] of xref:mp_units/base_dimension.adoc[base_dimension], declared inside an implementation-defined base class: it can be found only through argument-dependent lookup.
====

== Return Value

[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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