[#mp_units-quantity_point-08-numerical_value_in-04]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity_point-08.adoc[quantity_point]::numerical_value_in
:relfileprefix: ../../
:mrdocs:

Returns the numerical value of this quantity point on the scale of another unit, implicitly convertible to `rep`.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/UnitOf.adoc[UnitOf<quantity_spec>] U>
requires (PO == default_point_origin(R)) && detail::ImplicitScaling<unit, U{}, rep>
[[nodiscard]]
constexpr
xref:mp_units/RepresentationOf.adoc[RepresentationOf<quantity_spec>] auto
numerical_value_in(U u) const noexcept;
----

== Description

This is the exact inverse of `point<U>(value)` and is provided only for points that use `default_point_origin(R)` ‐ the same condition under which text output and `quantity_from_zero()` are available. Points with a custom origin have no unique numerical representation, so their value must be requested from an explicit origin via `quantity_from(origin).numerical_value_in(U)`.

== Return Value

The numerical value expressed in `u`.

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

[cols="1,4"]
|===
| Name| Description
| *u*
| the target unit, measured from the default point origin of that unit
|===


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