[#mp_units-quantity_point-08-quantity_ref_from-07]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity_point-08.adoc[quantity_point]::quantity_ref_from
:relfileprefix: ../../
:mrdocs:

Returns a mutable reference to the underlying quantity, measured from `point_origin`.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/PointOrigin.adoc[PointOrigin] PO2>
requires (PO2{} == point_origin)
[[nodiscard]]
constexpr
xref:mp_units/quantity_point-08/quantity_type.adoc[quantity_type]&
quantity_ref_from(PO2 po) & noexcept;
----

== Return Value

A reference to the stored offset quantity.

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

[cols="1,4"]
|===
| Name| Description
| *po*
| a point origin equal to `point_origin`
|===


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