[#mp_units-quantity-01-numerical_value_ref_in-01]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity-01.adoc[quantity]::numerical_value_ref_in
:relfileprefix: ../../
:mrdocs:

Deleted overload that prevents forming a reference into a temporary quantity.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/Unit.adoc[Unit] U>
requires (equivalent(U{}, unit))
constexpr
xref:mp_units/quantity-01/rep.adoc[rep] const&&
numerical_value_ref_in(U u) const && noexcept = delete;
----

== Return Value

The type used to represent the numerical value of the quantity.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *u*
| a unit equivalent to `unit`
|===


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