[#mp_units-operator_star-02b]
= xref:mp_units.adoc[mp_units]::operator*
:relfileprefix: ../
:mrdocs:

Multiplies a unit by a reference

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
consteval
/* implementation-defined */
operator*(
    U1 u1,
    xref:mp_units/reference-0b2.adoc[reference] r);
----

== Return Value

a reference resulting from multiplying the quantity specification and the unit

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

[cols="1,4"]
|===
| Name| Description
| *u1*
| the unit to multiply
| *r*
| the reference to multiply by
|===


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